Attribution

5th Grade Science

absorb/absorption
"Sponge Wet" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/sponge-wet-yellow-2022682/

adapt/adaptation
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/
"Mouse Rodent Rat" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/mouse-rodent-rat-black-cute-296396/
"Gerbil Mouse Rodent" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/gerbil-mouse-rodent-brown-animal-303178/

atmosphere
"Earth Globe Planet" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/earth-globe-planet-world-147591/
"Zelkova Serrata Tree Bonsai" by Deedster [CC0] (cropped and rotated) via Pixabay https://pixabay.com/en/zelkova-serrata-tree-bonsai-zelkova-1613784/

average
This image was created solely by Stephen Fleenor, PhD (Seidlitz Education)

axis
"Rotating earth (huge)" by The MP [CC BY 3.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Rotating_earth_(huge).gif

battery
"Light Bulb Lightbulb" by Clker-Free-Vector-Images [CC0] (rotated) via Pixabay https://pixabay.com/vectors/light-bulb-lightbulb-light-bulb-34547/
"Battery Energy Power" by OpenClipart-Vectors [CC0] (rotated) via Pixabay https://pixabay.com/vectors/battery-energy-power-cell-156718/

behavioral adaptation
"Simple world map" by Tom-b [CC0 1.0] (brightened and continents removed) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Simple_world_map.svg
"Bird Silhouette Flying" by Elionas [CC0] (rotated and glow added) via Pixabay https://pixabay.com/en/bird-silhouette-flying-movement-1314469/
"Bear Lies Sleeps" by creozavr [CC0] (rotated) via Pixabay https://pixabay.com/illustrations/bear-lies-sleeps-sleep-resting-2079672/
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/

benefit/beneficial
"Rabbit Silhouette Black Isolated" by Gorkhs [CC0] (no alterations) via Pixabay https://pixabay.com/en/rabbit-silhouette-black-2262101/
"Cougar Mountain Lion" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/cougar-mountain-lion-wild-animal-47667/
"Cloud Overcast Weather" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/cloud-overcast-weather-159388/
"Rain Cloud Nature" by Clker-Free-Vector-Images [CC0] (cropped) via Pixabay https://pixabay.com/vectors/rain-cloud-nature-weather-sky-310148/
"Smiley Face Smile" by PixLoger [CC0] (recolored) via Pixabay https://pixabay.com/en/smiley-face-smile-good-nice-3189739/
"Smiley Face Average" by PixLoger [CC0] (recolored) via Pixabay https://pixabay.com/en/smiley-face-average-okay-3189736/
"Smiley Face Bad" by PixLoger [CC0] (recolored) via Pixabay https://pixabay.com/en/smiley-face-bad-sad-3189737/

biofuels
"Compost Garbage Biological" by Couleur [CC0] (cropped) via Pixabay https://pixabay.com/photos/compost-garbage-biological-waste-3663514/
"bacterium h bacterium" by Unknown [CC0] (no alterations) via SVG Silh https://svgsilh.com/image/1455818.html
"bacteria illness bacterium infection" by Unknown [CC0] (no alterations) via SVG Silh https://svgsilh.com/image/156869.html
"Beaker Chemistry Empty" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/beaker-chemistry-empty-glasswares-159174/
"Oil Olive Greek" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/oil-olive-oil-greek-italian-olive-159855/
"Alga Algae Marine" by OpenClipart-Vectors [CC0] (rotated) via Pixabay https://pixabay.com/vectors/alga-algae-marine-ocean-plant-sea-1299962/

canyon
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/

carnivore
"Cougar Mountain Lion" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/cougar-mountain-lion-wild-animal-47667/
"Rabbit Silhouette Black Isolated" by Gorkhs [CC0] (no alterations) via Pixabay https://pixabay.com/en/rabbit-silhouette-black-2262101/
"Checkmark green" by Nobbler 76 [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Checkmark_green.svg

cementation
"Mountain Hill Rock" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/mountain-hill-rock-peak-barren-575618/
"Húsafell Stone" by Pudpon [CC0 1.0] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:H%C3%BAsafell_Stone.png
"Glue Bottle Orange" by Clker-Free-Vector-Images [CC0] (rotated) via Pixabay https://pixabay.com/vectors/glue-bottle-orange-blue-fluid-306757/

characteristic
This image was created solely by Stephen Fleenor, PhD (Seidlitz Education)

circuit
"Light Bulb Lightbulb" by Clker-Free-Vector-Images [CC0] (rotated) via Pixabay https://pixabay.com/vectors/light-bulb-lightbulb-light-bulb-34547/
"Battery Energy Power" by OpenClipart-Vectors [CC0] (rotated) via Pixabay https://pixabay.com/vectors/battery-energy-power-cell-156718/
"Alarm Bell Doorbell" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/alarm-bell-doorbell-electric-2027136/
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/hot-temperature-thermometer-weather-159386/

climate
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/hot-temperature-thermometer-weather-159386/
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/
"Wind Energy Renewable" by OpenClipart-Vectors [CC0] (cropped and recolored) via Pixabay https://pixabay.com/vectors/wind-energy-renewable-energy-wind-2029621/
"Weather Icons Cloud" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/weather-icons-cloud-meteorology-160759/
"Water Droplet" by madartzgraphics [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/water-water-droplet-droplet-2072211/

closed/complete circuit
"Light Bulb Lightbulb" by Clker-Free-Vector-Images [CC0] (rotated) via Pixabay https://pixabay.com/vectors/light-bulb-lightbulb-light-bulb-34547/
"Battery Energy Power" by OpenClipart-Vectors [CC0] (rotated) via Pixabay https://pixabay.com/vectors/battery-energy-power-cell-156718/

cloud coverage
"Zelkova Serrata Tree Bonsai" by Deedster [CC0] (cropped and rotated) via Pixabay https://pixabay.com/en/zelkova-serrata-tree-bonsai-zelkova-1613784/
"Cloud Overcast Weather" by OpenClipat-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/cloud-overcast-weather-159388/

community
"Rabbit Silhouette Black Isolated" by Gorkhs [CC0] (recolored) via Pixabay https://pixabay.com/en/rabbit-silhouette-black-2262101/
"Moose Large Body" by Clker-Free-Vector-Images [CC0] (recolored) via Pixabay https://pixabay.com/en/moose-large-body-animal-mammal-48465/
"Caterpillar Monarch Butterfly" by OpenClipart-Vectors [CC0] (recolored) via Pixabay https://pixabay.com/en/caterpillar-monarch-butterfly-156937/

compaction
"Mountain Hill Rock" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/mountain-hill-rock-peak-barren-575618/
"Húsafell Stone" by Pudpon [CC0 1.0] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:H%C3%BAsafell_Stone.png

compete/competition
"Fighting Nyalas" by Papphase [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Fighting_Nyalas.JPG
"Hyenas Fight Against Lions Over a Kill HD 12" by Kruger Sightings HD [CC BY 3.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Hyenas_Fight_Against_Lions_Over_a_Kill_HD_12.png
"Steenbock Kruger Deer" by WiseTraveller [CC0] (edges softened) via Pixabay https://pixabay.com/photos/steenbok-kruger-deer-antelope-1364425/

condensation
"Rg1024 Set of water drops" by rg1024 [CC0 1.0] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Rg1024_Set_of_water_drops.svg
"Glass Water Condensation" by Free-Photos [CC0] (cropped) via Pixabay https://pixabay.com/photos/glass-water-condensation-cold-ice-1209754/
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (temperature changed) via Pixabay https://pixabay.com/vectors/hot-temperature-thermometer-weather-159386/
"Cloud Overcast Weather" by OpenClipat-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/cloud-overcast-weather-159388/

conduction/conduct
"Light Bulb Lightbulb" by Clker-Free-Vector-Images [CC0] (rotated) via Pixabay https://pixabay.com/vectors/light-bulb-lightbulb-light-bulb-34547/
"Battery Energy Power" by OpenClipart-Vectors [CC0] (rotated) via Pixabay https://pixabay.com/vectors/battery-energy-power-cell-156718/
"cooking, pot, kitchen, stainless, steel, stove" by Marcelo [Public Domain] (cropped) via Pixnio https://pixnio.com/objects/cooking-pot-on-the-kitchen-stove

conductor
"Beaker Chemistry Full" by OpenClipart-Vectors [CC0] (contrast adjusted, transparency filter added, and water level changed) via Pixabay https://pixabay.com/vectors/beaker-chemistry-full-glasswares-159176/
"Enamelled litz copper wire" by Alisdojo [CC0 1.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Enamelled_litz_copper_wire.JPG
"Block Wooden Wood" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/block-wooden-wood-rectangular-575426/

consumer
"Marine food web" by Siyavula Education [CC BY 2.0] (no alterations) via Flickr https://www.flickr.com/photos/121935927@N06/13578843423

crater
"Earth Globe Planet" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/earth-globe-planet-world-147591/
"Moon Planet Outer Space Solar" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/moon-planet-outer-space-26619/
"Wallpaper Background Asteroid" by ipicgr [CC0] (background removed) via Pixabay https://pixabay.com/illustrations/wallpaper-background-asteroid-1493366/
"Crater Volcano Hawaii Haleakala" by Pexels [CC0] (cropped) via Pixabay https://pixabay.com/photos/crater-volcano-hawaii-1846775/
"Moon Craters Crater" by WikiImages [CC0] (cropped) via Pixabay https://pixabay.com/photos/moon-moon-craters-crater-508756/

decay/decompose/decomposition
"Bones Bleached White" by holmespj [CC0] (cropped) via Pixabay https://pixabay.com/photos/bones-bleached-white-death-drought-3670740/
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/
"Branch Leaf Tree" by Clker-Free-Vector-Images [CC0] (rotated) via Pixabay https://pixabay.com/vectors/branch-leaf-tree-dead-fall-plant-37778/
"Dead mouse" by Madprime [CC0 1.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Dead_mouse.svg

decomposer/detritivore
"bacterium h bacterium" by Unknown [CC0] (no alterations) via SVG Silh https://svgsilh.com/image/1455818.html
"bacteria illness bacterium infection" by Unknown [CC0] (no alterations) via SVG Silh https://svgsilh.com/image/156869.html
"Branch Leaf Tree" by Clker-Free-Vector-Images [CC0] (rotated) via Pixabay https://pixabay.com/vectors/branch-leaf-tree-dead-fall-plant-37778/
"Dead mouse" by Madprime [CC0 1.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Dead_mouse.svg
"Mushroom Cartoon Fungus" by basker_Dhandapani [CC0] (no alterations) via Pixabay https://pixabay.com/illustrations/mushroom-cartoon-fungus-vegetable-2844146/
"Tree Art Artwork" by OpenClipart-Vectorts [CC0] (rotated) via Pixabay https://pixabay.com/vectors/tree-art-artwork-trunk-cartoon-576866/
"Biodiversity Earthworm Fertilizer" by OpenClipart-Vectors [CC0] (rotated) via Pixabay https://pixabay.com/vectors/biodiversity-earthworm-fertilizer-160380/

delta
"Mountain Hill Rock" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/mountain-hill-rock-peak-barren-575618/
"Cloud Overcast Weather" by OpenClipat-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/cloud-overcast-weather-159388/
"Rain Cloud Nature" by Clker-Free-Vector-Images [CC0] (cropped) via Pixabay https://pixabay.com/vectors/rain-cloud-nature-weather-sky-310148/
"Mouths of amazon geocover 1990" by NASA [Public Domain] (no alterations) via Wikipedia https://hif.m.wikipedia.org/wiki/file:Mouths_of_amazon_geocover_1990.png

dense/density
"Stone Rock" by kalhh [CC0] (cropped) via Pixabay https://pixabay.com/illustrations/stone-rock-isolated-2010928/
"Pumice Stone and Rusty Bar" by Circe Denyer [CC0] (cropped) via PublicDomainPictures https://www.publicdomainpictures.net/en/view-image.php?image=244684&picture=pumice-stone-and-rusty-bar
"Beaker Chemistry Full" by OpenClipart-Vectors [CC0] (contrast adjusted, transparency filter added, and water level changed) via Pixabay https://pixabay.com/vectors/beaker-chemistry-full-glasswares-159176/

deposition
"Beach Desert Dune Sand" by OpenClipart-Vectors [CC0] (dune erased) via Pixabay https://pixabay.com/vectors/beach-desert-dune-sand-157340/
"Wind Energy Renewable" by OpenClipart-Vectors [CC0] (cropped and recolored) via Pixabay https://pixabay.com/vectors/wind-energy-renewable-energy-wind-2029621/
"Húsafell Stone" by Pudpon [CC0 1.0] (cropped and recolored) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:H%C3%BAsafell_Stone.png

dissolve/dissolution
"Beaker Chemistry Empty" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/beaker-chemistry-empty-glasswares-159174/

ecosystem
"Rabbit Silhouette Black Isolated" by Gorkhs [CC0] (recolored) via Pixabay https://pixabay.com/en/rabbit-silhouette-black-2262101/
"Moose Large Body" by Clker-Free-Vector-Images [CC0] (recolored) via Pixabay https://pixabay.com/en/moose-large-body-animal-mammal-48465/
"Caterpillar Monarch Butterfly" by OpenClipart-Vectors [CC0] (recolored) via Pixabay https://pixabay.com/en/caterpillar-monarch-butterfly-156937/
"Pond Water Outdoor" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/pond-water-outdoor-grass-outdoors-310149/

electric current
"Light Bulb Lightbulb" by Clker-Free-Vector-Images [CC0] (rotated and cropped) via Pixabay https://pixabay.com/vectors/light-bulb-lightbulb-light-bulb-34547/
"Battery Energy Power" by OpenClipart-Vectors [CC0] (rotated) via Pixabay https://pixabay.com/vectors/battery-energy-power-cell-156718/

electrical energy
"Socket Wall Electric" by Clker-Free-Vector-Images [CC0] (background removed) via Pixabay https://pixabay.com/vectors/socket-wall-electric-power-plug-33137/
"Power Station Current The Industry" by JerryGorecki [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/power-station-current-the-industry-3664263/
"Solar Panel Photovoltaic" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/solar-panel-photovoltaic-solar-cells-303455/
"Wind Turbine Energy" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/wind-turbine-wind-energy-electricity-297804/
"Building House Home" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/building-house-home-construction-295215/
"Utility Pole Electrical Tower" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/utility-pole-electrical-tower-296441/

electricity
"Electric Cables Electrification Of" by pasja1000 [CC0] (cropped) via Pixabay https://pixabay.com/photos/electric-cables-electrification-of-3657404/
"Thunder Thunderstorm Violet" by ronomore [CC0] (cropped) via Pixabay https://pixabay.com/photos/thunder-thunderstorm-violet-purple-953118/

energy
"Rg1024 Set of water drops" by rg1024 [CC0 1.0] (cropped and recolored) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Rg1024_Set_of_water_drops.svg
"Fire Flames Hell" by Clker-Free-Vector-Images [CC0] (stretched, rotated, and cropped) via Pixabay https://pixabay.com/vectors/fire-flames-hell-burn-bright-307336/
"Cooking Pot Kitchen" by Titanium_Petal [CC0] (no alterations) via Pixabay https://pixabay.com/illustrations/cooking-pot-kitchen-stove-3311435/
"Light Torch Lamp" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/light-torch-lamp-electric-159858/
"Battery Energy Power" by OpenClipart-Vectors [CC0] (rotated) via Pixabay https://pixabay.com/vectors/battery-energy-power-cell-156718/
"Socket Wall Electric" by Clker-Free-Vector-Images [CC0] (background removed) via Pixabay https://pixabay.com/vectors/socket-wall-electric-power-plug-33137/
"Alarm Bell Doorbell" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/alarm-bell-doorbell-electric-2027136/
"Wind Turbine Energy" by Clker-Free-Vector-Images [CC0] (cropped) via Pixabay https://pixabay.com/vectors/wind-turbine-wind-energy-electricity-297804/
"Applications-system" by The people from the Tango! Project [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Applications-system.svg
"Amplification Demo Demonstration" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/amplification-demo-demonstration-1294300/

environment
"Rabbit Silhouette Black Isolated" by Gorkhs [CC0] (recolored) via Pixabay https://pixabay.com/en/rabbit-silhouette-black-2262101/
"Moose Large Body" by Clker-Free-Vector-Images [CC0] (recolored) via Pixabay https://pixabay.com/en/moose-large-body-animal-mammal-48465/
"Caterpillar Monarch Butterfly" by OpenClipart-Vectors [CC0] (recolored) via Pixabay https://pixabay.com/en/caterpillar-monarch-butterfly-156937/
"Pond Water Outdoor" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/pond-water-outdoor-grass-outdoors-310149/
"Human body silhouette" by Mikael Häggström [Public Domain] (recolored) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Human_body_silhouette.svg
"Fish Tuna Blue" by Clker-Free-Vector-Images [CC0] (recolored) via Pixabay https://pixabay.com/vectors/fish-tuna-blue-sea-food-seafood-30828/

equator
"Earth Globe Planet" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/earth-globe-planet-world-147591/

erosion
"Mountain Hill Rock" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/mountain-hill-rock-peak-barren-575618/
"Wind Energy Renewable" by OpenClipart-Vectors [CC0] (cropped and recolored) via Pixabay https://pixabay.com/vectors/wind-energy-renewable-energy-wind-2029621/
"Cloud Overcast Weather" by OpenClipat-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/cloud-overcast-weather-159388/
"Rain Cloud Nature" by Clker-Free-Vector-Images [CC0] (cropped) via Pixabay https://pixabay.com/vectors/rain-cloud-nature-weather-sky-310148/

evaporation
"Rg1024 Set of water drops" by rg1024 [CC0 1.0] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Rg1024_Set_of_water_drops.svg
"Beaker Chemistry Full" by OpenClipart-Vectors [CC0] (contrast adjusted, transparency filter added, and water level changed) via Pixabay https://pixabay.com/vectors/beaker-chemistry-full-glasswares-159176/

flow
"Beach Ball Inflatable" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/beach-ball-ball-inflatable-beach-575425/
"Sunset River Mountains" by deMysticWay [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/sunset-river-mountains-sky-nature-2976428/
"Battery Energy Power" by OpenClipart-Vectors [CC0] (rotated) via Pixabay https://pixabay.com/vectors/battery-energy-power-cell-156718/

flow of energy
"Caterpillar Monarch Butterfly" by OpenClipart-Vectors [CC0] (rotated) via Pixabay https://pixabay.com/en/caterpillar-monarch-butterfly-156937/
"Cougar Mountain Lion" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/cougar-mountain-lion-wild-animal-47667/
"Bird" by yves_guillou (OCAL) [Public Domain] (no alterations) via Free Stock Photos http://www.freestockphotos.biz/stockphoto/15184

food chain
"Caterpillar Monarch Butterfly" by OpenClipart-Vectors [CC0] (rotated) via Pixabay https://pixabay.com/en/caterpillar-monarch-butterfly-156937/
"Cougar Mountain Lion" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/cougar-mountain-lion-wild-animal-47667/
"Bird" by yves_guillou (OCAL) [Public Domain] (no alterations) via Free Stock Photos http://www.freestockphotos.biz/stockphoto/15184

food web
"Marine food web" by Siyavula Education [CC BY 2.0] (no alterations) via Flickr https://www.flickr.com/photos/121935927@N06/13578843423

force
"Magnet Magnetic Poles Magnetism" by Clker-Free-Vector-Images [CC0] (rotated) via Pixabay https://pixabay.com/vectors/magnet-magnetic-poles-magnetism-297698/
"Tree Apple" by Kjristie [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/tree-apple-apple-tree-nature-fruit-923776/
"Apple Red Fruit" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/apple-red-fruit-vitamins-healthy-158419/
"Crate Box Wooden" by Clker-Free-Vector-Images [CC0] (elongated) via Pixabay https://pixabay.com/vectors/crate-box-wooden-container-package-310787/
"Push Pushing Move Moving" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/push-pushing-move-moving-action-150175/
"Silhouette Relationship Conflict" by mohamed_hassan [CC0] (cropped) via Pixabay https://pixabay.com/vectors/silhouette-relationship-conflict-3141264/

fossil
"Soil Earth Excavation" by OpenClipart-Vectors [CC0] (recolored and cropped) via Pixabay https://pixabay.com/vectors/soil-earth-excavation-exposed-575643/
"Lizard Gecko Dragon" by Clker-Free-Vector-Images [CC0] (cropped and rotated) via Pixabay https://pixabay.com/vectors/lizard-gecko-dragon-animal-cartoon-23157/
"Dinosaur Lizard Fossil" by Petr Kratochvil [CC0] (cropped and rotated) via Needpix https://www.needpix.com/photo/1384234/dinosaur-lizard-fossil-old-ancient-stone-nature-rock-geology
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/

fossil fuel
"Barrel Container Oil" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/barrel-container-oil-metal-drum-36724/
"Briquette Black Coal" by Unknown [CC0] (no alterations) via Max Pixel https://www.maxpixel.net/Briquette-Black-Coal-471903
"Drilling Oil Rig" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/drilling-oil-rig-pump-petroleum-36265/
"Soil Earth Excavation" by OpenClipart-Vectors [CC0] (recolored and cropped) via Pixabay https://pixabay.com/vectors/soil-earth-excavation-exposed-575643/
"Fire Flames Heat" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/fire-flames-heat-campfire-bonfire-1295306/

freeze/freezing
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (temperature changed) via Pixabay https://pixabay.com/vectors/hot-temperature-thermometer-weather-159386/

friction
"Kick Soccer Man" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/kick-soccer-man-black-people-149618/

function
"Medical Sister Syringe White Male" by 3dman_eu [CC0] (no alterations) via Pixabay https://pixabay.com/illustrations/medical-sister-syringe-white-male-1780696/
"Craftsman Mechanic Helm" by 3dman_eu [CC0] (no alterations) via Pixabay https://pixabay.com/illustrations/craftsmen-mechanic-helm-workers-1020156/ \
"Chef Cook Spices" by 3dman_eu [CC0] (no alterations) via Pixabay https://pixabay.com/illustrations/chef-cook-spices-seasoning-1816252/
"Males Model 3D Isolated" by 3dman_eu [CC0] (no alterations) via Pixabay https://pixabay.com/illustrations/males-3d-model-isolated-3d-model-2065283/

glacier
"Mountain Hill Rock" by OpenClipart-Vectors [CC0] (brightness and contrast adjusted) via Pixabay https://pixabay.com/vectors/mountain-hill-rock-peak-barren-575618/
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/
"Snow Snowy Weather" by OpenClipat-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/cloud-overcast-weather-159388/

gravity
"Pilates Pilate Ball" by CoxinhaFotos [CC0] (cropped, recolored, and brightness adjusted) via Pixabay https://pixabay.com/vectors/pilates-pilate-ball-sphere-2137509/
"Grass Meadow Green" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/grass-meadow-green-agriculture-159804/
"Lifting Box Wood" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/lifting-box-wood-heavy-crate-24401/

groundwater
"Rg1024 Set of water drops" by rg1024 [CC0 1.0] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Rg1024_Set_of_water_drops.svg
"Cloud Overcast Weather" by OpenClipat-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/cloud-overcast-weather-159388/
"Rain Cloud Nature" by Clker-Free-Vector-Images [CC0] (cropped) via Pixabay https://pixabay.com/vectors/rain-cloud-nature-weather-sky-310148/

herbivore
"Deer Male Animal" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/deer-male-animal-mammal-antlers-48417/
"Rabbit Silhouette Black Isolated" by Gorkhs [CC0] (no alterations) via Pixabay https://pixabay.com/en/rabbit-silhouette-black-2262101/
"Checkmark green" by Nobbler 76 [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Checkmark_green.svg

hibernation
"Bear Lies Sleeps" by creozavr [CC0] (rotated) via Pixabay https://pixabay.com/illustrations/bear-lies-sleeps-sleep-resting-2079672/
"Animal Bear Brown" by OpenClipart-Vectors [CC0] (rotated) via Pixabay https://pixabay.com/vectors/animal-bear-brown-cub-cute-hairy-160462/
"Landscape Spring Summer" by OpenClipart-Vectors [CC0] (cropped and recolored) via Pixabay https://pixabay.com/vectors/landscape-spring-summer-fields-152502/
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/

humidity
"Water Droplet" by madartzgraphics [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/water-water-droplet-droplet-2072211/
"Zelkova Serrata Tree Bonsai" by Deedster [CC0] (cropped and rotated) via Pixabay https://pixabay.com/en/zelkova-serrata-tree-bonsai-zelkova-1613784/

ingredient
"Drinks Lemon Ade Cool" by eommina [CC0] (no alterations) via Pixabay https://pixabay.com/photos/drinks-lemon-ade-cool-lemonade-1825702/
"Water Glass Drip" by boristrost [CC0] (no alterations) via Pixabay https://pixabay.com/photos/water-glass-drip-drink-clear-1585192/
"Salt Cooking Rock Salt" by moritz320 [CC0] (cropped) via Pixabay https://pixabay.com/photos/salt-cooking-salt-rock-salt-4418749/
"Lemons Yellow Food" by Richardjohn [CC0] (no alterations) via Pixabay https://pixabay.com/photos/lemons-yellow-food-fruit-fresh-2039830/

inherited trait
"DNA mutation" by Mouagip [Public Domain] (recolored, cropped and labels removed) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:DNA_UV_mutation.svg
"Mouse Brown Pink" by Clker-Free-Vector-Images [CC0] (rotated) via Pixabay https://pixabay.com/vectors/mouse-brown-pink-cute-ears-tail-304966/
"Mouse Rodent Black" by Clker-Free-Vector-Images [CC0] (rotated) via Pixabay https://pixabay.com/vectors/mouse-rodent-black-animal-cute-303746/
"Mouse Rodent Rat" by Clker-Free-Vector-Images [CC0] (rotated) via Pixabay https://pixabay.com/vectors/mouse-rodent-rat-black-cute-296396/

instinct
"Goat Eating Animal" by Clker-Free-Vector-Images [CC0] (cropped and rotated) via Pixabay https://pixabay.com/vectors/goat-eating-animal-mammal-meadow-30806/
"Goat Animal Biology" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/goat-animal-biology-mammal-zoology-153826/
"For Reading Grandmother Grandchild" by dassel [CC0] (cropped) via Pixabay https://pixabay.com/photos/for-reading-grandmother-grandchild-752607/
"Fox Wolf Animal" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/fox-wolf-animal-biology-mammal-153450/

insulate/insulator/insulation
"Cables Wires The Combination Of" by jarmoluk [CC0] (cropped) via Pixabay https://pixabay.com/photos/cables-wires-the-combination-of-1080555/

interaction
"Rabbit Silhouette Black Isolated" by Gorkhs [CC0] (recolored) via Pixabay https://pixabay.com/en/rabbit-silhouette-black-2262101/
"Pond Water Outdoor" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/pond-water-outdoor-grass-outdoors-310149/
"Cougar Mountain Lion" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/cougar-mountain-lion-wild-animal-47667/
"Griffith experiment" by Madprime [CC0 1.0] (cropped and rotated) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Griffith_experiment.svg
"Fish Tuna Blue" by Clker-Free-Vector-Images [CC0] (recolored) via Pixabay https://pixabay.com/vectors/fish-tuna-blue-sea-food-seafood-30828/
"Animal Shadow Tail" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/animal-shadow-tail-tongue-coyote-44780/
"Cave Hole" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/cave-hole-mountain-145615/

interdependence
"Bees Insects Blossom" by Buntysmum [CC0] (cropped) via Pixabay https://pixabay.com/photos/bees-insects-blossom-blackberry-4003580/
"Anemones Tentacle Sea" by Efraimstochter [CC0] (no alterations) via Pixabay https://pixabay.com/photos/anemones-tentacle-sea-anemones-793401/
"Home House Icons Jims" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/home-house-icons-jims-card-1294564/
"Fruits Vegetables Artichoke" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/fruits-vegetables-artichoke-banana-155616/
"Soil Eart Poo" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/soil-eart-poo-brown-dirt-heap-576296/

landform
"Mt Fuji Volcano Foggy" by kimura2 [CC0] (cropped) via Pixabay https://pixabay.com/photos/mt-fuji-volcano-foggy-mountain-477832/
"Tuscany Panorama Landscape" by Schwoaze [CC0] (cropped) via Pixabay https://pixabay.com/photos/tuscany-panorama-landscape-forest-3364498/
"Namibia Desert Sand" by FuN_Lucky [CC0] (cropped) via Pixabay https://pixabay.com/photos/namibia-desert-sand-dune-dust-2049203/
"Landscape Mountains Valleys" by Free-Photos (cropped) via Pixabay https://pixabay.com/photos/landscape-mountains-valleys-hills-691374/
"Canyon, north eastern Kurdistan" by Jim Gordon [CC BY 2.0] via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Canyon,_north_eastern_Kurdistan.jpg
"Mouths of amazon geocover 1990" by NASA [Public Domain] (no alterations) via Wikipedia https://hif.m.wikipedia.org/wiki/file:Mouths_of_amazon_geocover_1990.png

learned behavior
"Light Bulb Lightbulb" by Clker-Free-Vector-Images [CC0] (recolored) via Pixabay https://pixabay.com/vectors/light-bulb-lightbulb-light-bulb-34547/
"For Reading Grandmother Grandchild" by dassel [CC0] (cropped) via Pixabay https://pixabay.com/photos/for-reading-grandmother-grandchild-752607/
"Books Library Education" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/books-library-education-literature-42701/
"Babe Smile Newborn Small" by Victoria_Borodinova [CC0] (cropped) via Pixabay https://pixabay.com/photos/babe-smile-newborn-small-child-boy-2972221/
"Malinois Belgian Shepherd Dog" by 825545 [CC0] (cropped) via Pixabay https://pixabay.com/photos/malinois-belgian-shepherd-dog-leaves-741416/
"Fawn and Black Belgian Malinois Puppy on Green Grass" by Pixabay [CC0] (cropped) via Pexels https://www.pexels.com/photo/fawn-and-black-belgian-malinois-puppy-on-green-grass-209115/

lens
"Ant Insect" by OpenClipart-Vectors [CC0] (cropped and rotated) via Pixabay https://pixabay.com/vectors/ant-insect-animal-159283/
"Find Glass Magnifying" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/find-glass-magnifying-glass-search-148857/

light energy
"Light Torch Lamp" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/light-torch-lamp-electric-159858/
"Zelkova Serrata Tree Bonsai" by Deedster [CC0] (cropped and rotated) via Pixabay https://pixabay.com/en/zelkova-serrata-tree-bonsai-zelkova-1613784/

living
"Plants Tiny Sprouty" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/plants-tiny-sprouty-green-leaves-576558/
"Elephant Animal Trunk" by Clker-Free-Vector-Images [CC0] (cropped) via Pixabay https://pixabay.com/en/elephant-animal-trunk-tusks-large-48423/
"Dead mouse" by Madprime [CC0 1.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Dead_mouse.svg

magnetism
"Block Wooden Wood" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/block-wooden-wood-rectangular-575426/
"Magnet Physics Magnetism" by yeTis [CC0] (rotated) via Pixabay https://pixabay.com/illustrations/magnet-physics-magnetism-science-4683659/
"Magnet Physics Magnetism" by yeTis [CC0] (cropped) via Pixabay https://pixabay.com/illustrations/magnet-physics-magnetism-science-4708072/

mass
"Scales Kitchen Weighing" by Clker-Free-Vector-Images [CC0] (dial rotated) via Pixabay https://pixabay.com/vectors/scales-kitchen-scales-weighing-35902/
"Pilates Pilate Ball" by CoxinhaFotos [CC0] (cropped, recolored, and brightness adjusted) via Pixabay https://pixabay.com/vectors/pilates-pilate-ball-sphere-2137509/
"Full Moon Bright" by dunc [CC0] (cropped) via Pixabay https://pixabay.com/photos/full-moon-moon-bright-sky-space-496873/
"The Earth Terrestrial Globe Planet" by janeb [CC0] (cropped) via Pixabay https://pixabay.com/illustrations/the-earth-terrestrial-globe-planet-1179212/
"Weights Kilogram Kilo" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/weights-kilogram-kilo-metal-mass-157664/
"Balance Scale Weight" by OpenClipart-Vectors [CC0] (recolored) via Pixabay https://pixabay.com/vectors/balance-scale-weight-kitchen-154266/

matter
"Crate Box Wooden" by Clker-Free-Vector-Images [CC0] (rotated and transparency filter applied) via Pixabay https://pixabay.com/vectors/crate-box-wooden-container-package-310787/
"Beaker Chemistry Full" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/beaker-chemistry-full-glasswares-159176/
"Balance Scale Weight" by OpenClipart-Vectors [CC0] (recolored) via Pixabay https://pixabay.com/vectors/balance-scale-weight-kitchen-154266/
"Weights Kilogram Kilo" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/weights-kilogram-kilo-metal-mass-157664/
"Birthday Balloon Red" by Clker-Free-Vector-Images [CC0] (cropped and rotated) via Pixabay https://pixabay.com/vectors/birthday-balloon-red-one-single-296558/

mechanical energy
"Forklift Lift Truck Industrial" by samuelchavelas [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/forklift-lift-truck-industrial-3337360/
"Wind Turbine Energy" by Clker-Free-Vector-Images [CC0] (cropped) via Pixabay https://pixabay.com/vectors/wind-turbine-wind-energy-electricity-297804/
"Applications-system" by The people from the Tango! Project [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Applications-system.svg

medium
"Torch Flashlight Light" by Clker-Free-Vector-Images [CC0] (rotated) via Pixabay https://pixabay.com/vectors/torch-flashlight-light-battery-29615/
"Refraction photo" by ajizai [Public Domain] (rotated) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Refraction_photo.png
"Beaker Chemistry Full" by OpenClipart-Vectors [CC0] (contrast adjusted, transparency filter added, and water level changed) via Pixabay https://pixabay.com/vectors/beaker-chemistry-full-glasswares-159176/

melt/melting
"Melt Ice Cube" by Clker-Free-Vector-Images [CC0] (recolored and cropped) via Pixabay https://pixabay.com/vectors/melt-ice-cube-ice-melting-blue-25202/
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (temperature changed) via Pixabay https://pixabay.com/vectors/hot-temperature-thermometer-weather-159386/

migration
"Simple world map" by Tom-b [CC0 1.0] (brightened) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Simple_world_map.svg
"Bird Silhouette Flying" by Elionas [CC0] (rotated and glow added) via Pixabay https://pixabay.com/en/bird-silhouette-flying-movement-1314469/
"Moose Large Body" by Clker-Free-Vector-Images [CC0] (rotated, recolored and glow added) via Pixabay https://pixabay.com/en/moose-large-body-animal-mammal-48465/
"Dandelion Flowers" by Karen Arnold [CC0 1.0] (no alterations) via PublicDomainPictures https://www.publicdomainpictures.net/en/view-image.php?image=111268&picture=dandelion-flowers

mimicry
"Skull and crossbones" by Unknown [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Skull_and_crossbones.svg
"Eagle Bird Animal" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/eagle-bird-animal-flying-162195/
Untitled by Unknown [CC0] (cropped and rotated) via Pxhere https://pxhere.com/en/photo/86151
"coral, snake" by Luther C. Goldman, USFWS [CC0] (cropped) via Pixnio https://pixnio.com/fauna-animals/reptiles-and-amphibians/snakes-pictures/coral-snake mirror
"Torch Flashlight Light" by Clker-Free-Vector-Images [CC0] (rotated) via Pixabay https://pixabay.com/vectors/torch-flashlight-light-battery-29615/
"Panorama Regensburg Historic" by FelixMittermeier [CC0] (cropped) via Pixabay https://pixabay.com/photos/panorama-regensburg-historic-center-2646143/
"Monkey Mirror Stare" by a_m_o_u_t_o_n [CC0] (cropped and rotated0 via Pixabay https://pixabay.com/photos/monkey-mirror-stare-thinking-3512996/

mixture
"Beaker Chemistry Empty" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/beaker-chemistry-empty-glasswares-159174/
"Pile Heap Pyramid" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/pile-heap-pyramid-yellow-rocks-575648/
"Points Staples Colors Stops" by ElisaRiva [CC0] (cropped) via Pixabay https://pixabay.com/photos/points-staples-colors-stops-sheets-1859100/

model
"Pilates Pilate Ball" by CoxinhaFotos [CC0] (cropped, recolored, and brightness adjusted) via Pixabay https://pixabay.com/vectors/pilates-pilate-ball-sphere-2137509/
"Light Torch Lamp" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/light-torch-lamp-electric-159858/
"Fish Aquarium Sea" by visavietnam [CC0] (no alterations) via Pixabay https://pixabay.com/photos/fish-aquarium-sea-fish-tank-288988/
"Marine food web" by Siyavula Education [CC BY 2.0] (no alterations) via Flickr https://www.flickr.com/photos/121935927@N06/13578843423
"Crescent Moon Lunar" by Free-Photos [CC0] (brightness adjusted) via Pixabay https://pixabay.com/photos/crescent-moon-lunar-918793/

motion/move/movement
"Boy Female Girl" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/boy-female-girl-human-jumping-2029800/
"Silhouette Black Jumping" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/silhouette-black-jumping-man-guy-32193/
"People Walking Silhouette" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/people-walking-silhouette-black-33483/
"Bouncing Jump Child" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/bouncing-jump-child-girl-159517/

needs
"Home House Icons Jims" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/home-house-icons-jims-card-1294564/
"Fruits Vegetables Artichoke" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/fruits-vegetables-artichoke-banana-155616/
"Wind Energy Renewable" by OpenClipart-Vectors [CC0] (cropped and recolored) via Pixabay https://pixabay.com/vectors/wind-energy-renewable-energy-wind-2029621/
"Dead mouse" by Madprime [CC0 1.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Dead_mouse.svg
"Griffith experiment" by Madprime [CC0 1.0] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Griffith_experiment.svg

niche
"Bees Insects Blossom" by Buntysmum [CC0] (cropped) via Pixabay https://pixabay.com/photos/bees-insects-blossom-blackberry-4003580/
"Eʼelyaaígíí:Earthworm on stone" by s shepherd [CC BY 2.0] (no alterations) via Wikimedia Commons https://nv.wikipedia.org/wiki/Eʼelyaaígíí:Earthworm_on_stone.jpg

non-living
"Plants Tiny Sprouty" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/plants-tiny-sprouty-green-leaves-576558/
"Elephant Animal Trunk" by Clker-Free-Vector-Images [CC0] (cropped) via Pixabay https://pixabay.com/en/elephant-animal-trunk-tusks-large-48423/
"Dead mouse" by Madprime [CC0 1.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Dead_mouse.svg
"Rock Boulder Stone" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/rock-boulder-stone-nature-granite-576682/

ocean
"Mountain Hill Rock" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/mountain-hill-rock-peak-barren-575618/
"Cloud Overcast Weather" by OpenClipat-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/cloud-overcast-weather-159388/
"Rain Cloud Nature" by Clker-Free-Vector-Images [CC0] (cropped) via Pixabay https://pixabay.com/vectors/rain-cloud-nature-weather-sky-310148/

offspring
"Mouse Brown Pink" by Clker-Free-Vector-Images [CC0] (rotated) via Pixabay https://pixabay.com/vectors/mouse-brown-pink-cute-ears-tail-304966/
"Mouse Rodent Black" by Clker-Free-Vector-Images [CC0] (rotated) via Pixabay https://pixabay.com/vectors/mouse-rodent-black-animal-cute-303746/
"Mouse Rodent Rat" by Clker-Free-Vector-Images [CC0] (rotated) via Pixabay https://pixabay.com/vectors/mouse-rodent-rat-black-cute-296396/
"Simple diagram of bacterium (blank)" by domdomegg [CC BY 4.0] (rotated and DNA removed) via Wikimedia Commons
"Zelkova Serrata Tree Bonsai" by Deedster [CC0] (cropped, rotated and brightened) via Pixabay https://pixabay.com/en/zelkova-serrata-tree-bonsai-zelkova-1613784/
"Seedling Seed Growth" by REDQUASAR [CC0] (no alterations) via Pixabay https://pixabay.com/illustrations/seedling-seed-growth-plant-green-2163773/
"Park Acorns Oak" by pasja1000 [CC0] (croppped) via Pixabay https://pixabay.com/photos/park-acorns-oak-foliage-plant-3682796/

omnivore
"Brown Bear Standing" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/brown-bear-standing-animal-fur-48446/
"Rabbit Silhouette Black Isolated" by Gorkhs [CC0] (no alterations) via Pixabay https://pixabay.com/en/rabbit-silhouette-black-2262101/
"Checkmark green" by Nobbler 76 [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Checkmark_green.svg

open circuit
"Light Bulb Lightbulb" by Clker-Free-Vector-Images [CC0] (rotated, cropped and recolored) via Pixabay https://pixabay.com/vectors/light-bulb-lightbulb-light-bulb-34547/
"Battery Energy Power" by OpenClipart-Vectors [CC0] (rotated) via Pixabay https://pixabay.com/vectors/battery-energy-power-cell-156718/

orbit
"Earth Globe Planet" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/earth-globe-planet-world-147591/

organism
"Brown Bear Standing" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/brown-bear-standing-animal-fur-48446/
"Zelkova Serrata Tree Bonsai" by Deedster [CC0] (cropped and rotated) via Pixabay https://pixabay.com/en/zelkova-serrata-tree-bonsai-zelkova-1613784/
"Beedle Insect Bug" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/beetle-insect-bug-blue-black-legs-34372/
"Stem Leaves Paris Parts Plant" by Unknown [CC0] (no alterations) via Max Pixel https://www.maxpixel.net/Stem-Leaves-Paris-Plants-Leaf-2082612
"Mushroom Cartoon Fungus" by basker_Dhandapani [CC0] (no alterations) via Pixabay https://pixabay.com/illustrations/mushroom-cartoon-fungus-vegetable-2844146/
"Rock Stone Moos" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/rock-stone-moos-moss-158022/
"Bird" by yves_guillou (OCAL) [Public Domain] (no alterations) via Free Stock Photos http://www.freestockphotos.biz/stockphoto/15184

overpopulation
"Rabbit Silhouette Black Isolated" by Gorkhs [CC0] (recolored) via Pixabay https://pixabay.com/en/rabbit-silhouette-black-2262101/
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/

parallel circuit
"Light Bulb Lightbulb" by Clker-Free-Vector-Images [CC0] (rotated) via Pixabay https://pixabay.com/vectors/light-bulb-lightbulb-light-bulb-34547/
"Battery Energy Power" by OpenClipart-Vectors [CC0] (rotated) via Pixabay https://pixabay.com/vectors/battery-energy-power-cell-156718/
"Alarm Bell Doorbell" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/alarm-bell-doorbell-electric-2027136/

parent
"People Man Women" by AnnaliseArt [CC0] (cropped) via Pixabay https://pixabay.com/illustrations/people-man-women-grandma-grandpa-4035403/
"Zelkova Serrata Tree Bonsai" by Deedster [CC0] (cropped, rotated and brightened) via Pixabay https://pixabay.com/en/zelkova-serrata-tree-bonsai-zelkova-1613784/
"Seedling Seed Growth" by REDQUASAR [CC0] (no alterations) via Pixabay https://pixabay.com/illustrations/seedling-seed-growth-plant-green-2163773/
"Park Acorns Oak" by pasja1000 [CC0] (croppped) via Pixabay https://pixabay.com/photos/park-acorns-oak-foliage-plant-3682796/
"Deer Male Animal" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/deer-male-animal-mammal-antlers-48417/
"Deer Animal Mammal" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/deer-animal-mammal-spots-resting-48419/
"Deer Animal Mammal" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/deer-animal-mammal-wild-nature-48421/

physical change
"Melt Ice Cube" by Clker-Free-Vector-Images [CC0] (recolored) via Pixabay https://pixabay.com/vectors/melt-ice-cube-ice-melting-blue-25202/

physical property
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/en/hot-temperature-thermometer-weather-159386/
"Slippery Wet Floor Danger" by OpenIcons [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/slippery-wet-floor-danger-warning-98821/
"Experiment Chemistry Liquid" by PublicDomainPictures [CC0] (cropped) via Pixabay https://pixabay.com/photos/experiment-chemistry-liquid-220023/

population
"Rabbit Silhouette Black Isolated" by Gorkhs [CC0] (recolored) via Pixabay https://pixabay.com/en/rabbit-silhouette-black-2262101/
"Deer Male Animal" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/deer-male-animal-mammal-antlers-48417/

precipitation
"Weather Icons Cloud" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/weather-icons-cloud-meteorology-160759/
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (temperature changed) via Pixabay https://pixabay.com/vectors/hot-temperature-thermometer-weather-159386/

predator/prey
"Dead mouse" by Madprime [CC0 1.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Dead_mouse.svg
"Mouse" by Madprime (assumed) [CC0 1.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Mouse.svg
4.0] (rotated) via Wikimedia Commons https://en.wikipedia.org/wiki/File:Blank_Calendar_page_icon.svg
"Cougar Mountain Lion" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/cougar-mountain-lion-wild-animal-47667/

pressure
"Clamp Vice Grip" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/clamp-vice-grip-clasp-hold-tool-311532/

prism
"Refraction photo" by ajizai [Public Domain] (rotated and cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Refraction_photo.png
"Light dispersion conceptual waves" by Lucas Vieira [Public Domain] (background removed) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Light_dispersion_conceptual_waves.gif

producer
"Marine food web" by Siyavula Education [CC BY 2.0] (no alterations) via Flickr https://www.flickr.com/photos/121935927@N06/13578843423
"Checkmark green" by Nobbler 76 [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Checkmark_green.svg

property
"Antimony (Mexico) 2" by James St. John [CC BY 2.0] (brightened) via Flickr https://www.flickr.com/photos/jsjgeology/17150760398
"Arsenic (Andreasberg, Harz Mountains, Germany) 1" by James St. John [CC BY 2.0] (contrast increased) via Flickr https://www.flickr.com/photos/jsjgeology/17508918772
"Feather Blue Falling" by Yuri_B [CC0] (rotated and background removed) via Pixabay https://pixabay.com/vectors/feather-blue-falling-plume-flight-1689331/
"Lifting Box Wood" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/lifting-box-wood-heavy-crate-24401/

pull
"Crate Box Wooden" by Clker-Free-Vector-Images [CC0] (elongated) via Pixabay https://pixabay.com/vectors/crate-box-wooden-container-package-310787/
"Silhouette Relationship Conflict" by mohamed_hassan [CC0] (cropped) via Pixabay https://pixabay.com/vectors/silhouette-relationship-conflict-3141264/

push
"Crate Box Wooden" by Clker-Free-Vector-Images [CC0] (elongated) via Pixabay https://pixabay.com/vectors/crate-box-wooden-container-package-310787/
"Push Pushing Move Moving" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/push-pushing-move-moving-action-150175/

reflection
"Torch Flashlight Light" by Clker-Free-Vector-Images [CC0] (rotated) via Pixabay https://pixabay.com/vectors/torch-flashlight-light-battery-29615/

refraction
"Torch Flashlight Light" by Clker-Free-Vector-Images [CC0] (rotated) via Pixabay https://pixabay.com/vectors/torch-flashlight-light-battery-29615/
"Refraction photo" by ajizai [Public Domain] (rotated) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Refraction_photo.png

revolve/revolution
"Earth Globe Planet" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/earth-globe-planet-world-147591/
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/

role
"Medical Sister Syringe White Male" by 3dman_eu [CC0] (no alterations) via Pixabay https://pixabay.com/illustrations/medical-sister-syringe-white-male-1780696/
"Craftsman Mechanic Helm" by 3dman_eu [CC0] (no alterations) via Pixabay https://pixabay.com/illustrations/craftsmen-mechanic-helm-workers-1020156/ \
"Chef Cook Spices" by 3dman_eu [CC0] (no alterations) via Pixabay https://pixabay.com/illustrations/chef-cook-spices-seasoning-1816252/
"Males Model 3D Isolated" by 3dman_eu [CC0] (no alterations) via Pixabay https://pixabay.com/illustrations/males-3d-model-isolated-3d-model-2065283/

rotate/rotation
"Rotating earth (huge)" by The MP [CC BY 3.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Rotating_earth_(huge).gif
"Map Pin Illustrator" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/map-pin-illustrator-holder-place-42871/

sand dune
"Beach Desert Dune Sand" by OpenClipart-Vectors [CC0] (dune erased) via Pixabay https://pixabay.com/vectors/beach-desert-dune-sand-157340/
"Wind Energy Renewable" by OpenClipart-Vectors [CC0] (cropped and recolored) via Pixabay https://pixabay.com/vectors/wind-energy-renewable-energy-wind-2029621/
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/

satellite
"Earth Globe Planet" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/earth-globe-planet-world-147591/
"Beach Sandy Paradise Palm" by Walkerssk [CC0] (cropped) via Pixabay https://pixabay.com/photos/beach-sandy-beach-paradise-1824855/
"Satellite Image Coast Coastline" by Free-Photos [CC0] (no alterations) via Pixabay https://pixabay.com/photos/satellite-image-coast-coastline-1030781/
"Satellite Soyuz Spaceship Space" by Alexas_Fotos [CC0] (no alterations) via Pixabay https://pixabay.com/photos/satellite-soyuz-spaceship-2771043/

sediment
"Mountain Hill Rock" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/mountain-hill-rock-peak-barren-575618/
"Wind Energy Renewable" by OpenClipart-Vectors [CC0] (cropped and recolored) via Pixabay https://pixabay.com/vectors/wind-energy-renewable-energy-wind-2029621/
"Cloud Overcast Weather" by OpenClipat-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/cloud-overcast-weather-159388/
"Rain Cloud Nature" by Clker-Free-Vector-Images [CC0] (cropped) via Pixabay https://pixabay.com/vectors/rain-cloud-nature-weather-sky-310148/
"Satellite Soyuz Spaceship Space" by Alexas_Fotos [CC0] (no alterations) via Pixabay https://pixabay.com/photos/satellite-soyuz-spaceship-2771043/
"Sediment in the Gulf of Mexico" by Norman Kuring [Public Domain] (no alterations) via Wikimedia Commons https://en.wikipedia.org/wiki/File:Sediment_in_the_Gulf_of_Mexico.jpg

sedimentary rock
"Mountain Hill Rock" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/mountain-hill-rock-peak-barren-575618/
"Fossiliferous limestone (Tertiary; Florida, USA) 1 by James St. John [CC BY 2.0] (cropped) via Flickr https://www.flickr.com/photos/jsjgeology/24911425174

series circuit
"Light Bulb Lightbulb" by Clker-Free-Vector-Images [CC0] (rotated) via Pixabay https://pixabay.com/vectors/light-bulb-lightbulb-light-bulb-34547/
"Battery Energy Power" by OpenClipart-Vectors [CC0] (rotated) via Pixabay https://pixabay.com/vectors/battery-energy-power-cell-156718/
"Alarm Bell Doorbell" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/alarm-bell-doorbell-electric-2027136/

shadow
"Earth Globe Planet" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/earth-globe-planet-world-147591/
"Moon Planet Outer Space Solar" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/moon-planet-outer-space-26619/

solar energy
"Zelkova Serrata Tree Bonsai" by Deedster [CC0] (cropped and rotated) via Pixabay https://pixabay.com/en/zelkova-serrata-tree-bonsai-zelkova-1613784/
"Pond Water Outdoor" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/pond-water-outdoor-grass-outdoors-310149/
"Solar Panel Array Roof Home" by skeeze [CC0] (no alterations) via Pixabay https://pixabay.com/photos/solar-panel-array-roof-home-house-1591358/
"Illustration depicting the overturning circulation of the global ocean." by NASA/JPL [Public Domain] (no alterations) via NASA Jet Propulsion Laboratory https://www.jpl.nasa.gov/news/news.php?release=2010-101

soluble/solubility
"Beaker Chemistry Full" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/beaker-chemistry-full-glasswares-159176/

solution
"Beaker Chemistry Empty" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/beaker-chemistry-empty-glasswares-159174/

sound energy
"Alarm Bell Doorbell" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/alarm-bell-doorbell-electric-2027136/
"Socket Wall Electric" by Clker-Free-Vector-Images [CC0] (background removed) via Pixabay https://pixabay.com/vectors/socket-wall-electric-power-plug-33137/
"Kettledrums Kettledrum Drummer" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/kettledrums-kettledrum-drummer-37622/

species
"Amurtiger Tiger Big Cat" by Pixel-mixer [CC0] (cropped) via Pixabay https://pixabay.com/photos/amurtiger-tiger-big-cat-siberian-1975790/
"Puppy Labradoodle Pal" by slipschutz [CC0] (cropped) via Pixabay https://pixabay.com/photos/puppy-labradoodle-pal-friend-dog-5010561/
"Dog, Black Standard Poodle" by Karen Arnold [CC0 Public Domain] (cropped) via PublicDomainPictures https://www.publicdomainpictures.net/en/view-image.php?image=242148&picture=dog-black-standard-poodle
"Labrador Dog Outdoor" by stanze [CC0] (cropped) via Pixabay https://pixabay.com/photos/labrador-dog-outdoor-view-portrait-2121759/
"Cat Kitten Sit" by DarkWorkX [CC0] (cropped) via Pixabay https://pixabay.com/photos/cat-kitten-sit-isolated-red-white-2669554/

structural adaptation
"Rhinocerous Beetle Nature" by RolandKuck [CC0] (no alterations) via Pixabay https://pixabay.com/en/rhinoceros-beetle-nature-free-1974362/
"Archibald Thorburn, Peacock and Peacock Butterfly, At 87.5 x 111.5cm. Bonhams." by Bonhams [Public Domain] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Archibald_Thorburn,_Peacock_and_Peacock_Butterfly,_At_87.5_x_111.5cm._Bonhams..jpg
"Anteater Ant Eater" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/anteater-ant-eater-animal-giant-37870/

structure
Untitled by Unknown [CC0] (cropped) via Pxhere https://pxhere.com/en/photo/1361285
"Needles Pine Needle" by zoosnow [CC0] (cropped) via Pixabay https://pixabay.com/en/needles-pine-needle-tree-spruce-3357001/
"Perpusillus Swan Plumage" by meinstvienna [CC0] (cropped) via Pixabay https://pixabay.com/photos/perpusillus-swan-plumage-poultry-3700824/
"Horse Hoof Black and White Animals" by GoranH [CC0] (cropped) via Pixabay https://pixabay.com/photos/horse-hoof-black-and-white-animal-3684503/

substance
"Beaker Chemistry Full" by OpenClipart-Vectors [CC0] (recolored and cropped) via Pixabay https://pixabay.com/vectors/beaker-chemistry-full-glasswares-159176/
Untitled by unknown [CC0] (cropped and recolored) via Pxhere https://pxhere.com/en/photo/666730
"Explosions Pictogram Caution" by Clker-Free-Vector-Images [CC0] (cropped) via Pixabay https://pixabay.com/vectors/explosions-pictogram-caution-danger-28712/
"Fire Flame Flammable" by OpenIcons [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/flame-fire-flammable-inflammable-98645/

sunrise/sunset
"Rotating earth (huge)" by The MP [CC BY 3.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Rotating_earth_(huge).gif

survive/survival
"Dead mouse" by Madprime [CC0 1.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Dead_mouse.svg
"Mouse" by Madprime (assumed) [CC0 1.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Mouse.svg

switch
"Bolt Nut" by OpenClipart-Vectors [CC0] (rotated) via Pixabay https://pixabay.com/vectors/bolt-nut-screw-152911/

temperature
"Beauty Face Girl" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/beauty-face-girl-head-portrait-1299249/
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (temperature changed) via Pixabay https://pixabay.com/vectors/hot-temperature-thermometer-weather-159386/
"Melt Ice Cube" by Clker-Free-Vector-Images [CC0] (recolored and cropped) via Pixabay https://pixabay.com/vectors/melt-ice-cube-ice-melting-blue-25202/

texture
"Hand Fingers Grip" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/hand-fingers-grip-grasp-seize-149680/
"Ribbon Purple" by Silhouette1 [CC0] (cropped) via Pixabay https://pixabay.com/illustrations/ribbon-purple-silk-2929380/
"Thumbtack Tack Pink" by iblushay [CC0] (rotated) via Pixabay https://pixabay.com/illustrations/thumbtack-tack-pink-stationery-pin-496661/

thawing
"Mountain Hill Rock" by OpenClipart-Vectors [CC0] (brightness and contrast adjusted) via Pixabay https://pixabay.com/vectors/mountain-hill-rock-peak-barren-575618/
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (temperature changed) via Pixabay https://pixabay.com/vectors/hot-temperature-thermometer-weather-159386/
"Rg1024 Set of water drops" by rg1024 [CC0 1.0] (cropped and recolored) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Rg1024_Set_of_water_drops.svg

thermal energy
"Fire Flames Hell" by Clker-Free-Vector-Images [CC0] (stretched and rotated) via Pixabay https://pixabay.com/vectors/fire-flames-hell-burn-bright-307336/
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (temperature changed) via Pixabay https://pixabay.com/vectors/hot-temperature-thermometer-weather-159386/

tilt
"Earth Globe Planet" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/earth-globe-planet-world-147591/

transfer
"Battery Energy Power" by OpenClipart-Vectors [CC0] (rotated) via Pixabay https://pixabay.com/vectors/battery-energy-power-cell-156718/
"Melt Ice Cube" by Clker-Free-Vector-Images [CC0] (recolored) via Pixabay https://pixabay.com/vectors/melt-ice-cube-ice-melting-blue-25202/
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (temperature changed) via Pixabay https://pixabay.com/vectors/hot-temperature-thermometer-weather-159386/
"Light Torch Lamp" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/light-torch-lamp-electric-159858/
"Rabbit Silhouette Black Isolated" by Gorkhs [CC0] (no alterations) via Pixabay https://pixabay.com/en/rabbit-silhouette-black-2262101/

transmit/transmission
"Light Torch Lamp" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/light-torch-lamp-electric-159858/
"Pilates Pilate Ball" by CoxinhaFotos [CC0] (cropped, recolored, and brightness adjusted) via Pixabay https://pixabay.com/vectors/pilates-pilate-ball-sphere-2137509/
"Apples Farmers Market Business" by Pexels [CC0] (no alterations) via Pixabay https://pixabay.com/photos/apples-farmers-market-business-buy-1841132/

valley
"Mountain Hill Rock" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/mountain-hill-rock-peak-barren-575618/
"Narrow Valley (4329975582)" by Afghanistan Matters [CC BY 2.0] (cropped) via Wikimedia commons https://commons.wikimedia.org/wiki/File:Narrow_Valley_(4329975582).jpg
"Watch for U-shaped valleys throughout the park" by Unknown [Public Domain] (cropped) via NPS https://www.nps.gov/glac/learn/nature/glacial-geology.htm

volume
"Measuring Glass Graduated Cylinder" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/measuring-glass-graduated-cylinder-152967/
"Bolt Nut" by OpenClipart-Vectors [CC0] (rotated) via Pixabay https://pixabay.com/vectors/bolt-nut-screw-152911/

water cycle
"Mountain Hill Rock" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/mountain-hill-rock-peak-barren-575618/
"Forest Trees Evergreen" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/forest-trees-evergreen-conifers-310072/

water vapor
"Rg1024 Set of water drops" by rg1024 [CC0 1.0] (cropped and recolored) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Rg1024_Set_of_water_drops.svg
"Fire Flames Hell" by Clker-Free-Vector-Images [CC0] (stretched, rotated, and cropped) via Pixabay https://pixabay.com/vectors/fire-flames-hell-burn-bright-307336/
"Cooking Pot Kitchen" by Titanium_Petal [CC0] (no alterations) via Pixabay https://pixabay.com/illustrations/cooking-pot-kitchen-stove-3311435/
"Beverage Container Kitchen" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/beverage-container-kitchen-teapot-1300298/

weather
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/hot-temperature-thermometer-weather-159386/
"Wind Energy Renewable" by OpenClipart-Vectors [CC0] (cropped and recolored) via Pixabay https://pixabay.com/vectors/wind-energy-renewable-energy-wind-2029621/
"Weather Icons Cloud" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/weather-icons-cloud-meteorology-160759/
"Water Droplet" by madartzgraphics [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/water-water-droplet-droplet-2072211/

weight
"Scales Kitchen Weighing" by Clker-Free-Vector-Images [CC0] (dial rotated) via Pixabay https://pixabay.com/vectors/scales-kitchen-scales-weighing-35902/
"Pilates Pilate Ball" by CoxinhaFotos [CC0] (cropped, recolored, and brightness adjusted) via Pixabay https://pixabay.com/vectors/pilates-pilate-ball-sphere-2137509/

wind direction
"Wind Energy Renewable" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/wind-energy-renewable-energy-wind-2029621/
"Air Bag Wind Sock Weather" by MichaelGaida [CC0] (no alterations) via Pixabay https://pixabay.com/photos/air-bag-wind-sock-weather-sky-1857099/

wind speed
"Wind Energy Renewable" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/wind-energy-renewable-energy-wind-2029621/

6th Grade Science

abiotic
"Sunlight" by consuelo suarez [CC0] (cropped) via PublicDomainPictures https://www.publicdomainpictures.net/en/view-image.php?image=22515&picture=sunlight
"Drops of water liquid" by unknown [CC0] (cropped) via Pixabay https://pixabay.com/en/drops-of-water-water-liquid-fresh-578897/
"Soil" by Mesaytsegaye [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Soil.jpg
"Húsafell Stone" by Pudpon [CC0 1.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:H%C3%BAsafell_Stone.png

acceleration
"Stopwatch Racing Timer" by OpenClipart-Vectors [CC0] (second hand removed) via Pixabay https://pixabay.com/vectors/stopwatch-racing-timer-timing-153398/
"Speedometer Tachometer Gauge" by OpenClipart-Vectors [CC0] (needle removed) via Pixabay https://pixabay.com/vectors/speedometer-tachometer-gauge-mph-153399/
"Automobile Car Red" by OpenClipart-Vectors [CC0] (transparency filter applied) via Pixabay https://pixabay.com/vectors/automobile-car-red-french-old-1300467/

Animalia
"Turtle Tortoise Sea" by kormandallas [CC0] (cropped) via Pixabay https://pixabay.com/photos/turtle-tortoise-sea-immersion-deep-2250720/
"Fungus Forest Mushroom" by HeyouRelax [CC0] (cropped) via Pixabay https://pixabay.com/photos/fungus-forest-mushroom-wild-2158028/
"leafy, background" by Leon Brooks [Public Domain] (cropped) via Pixnio https://pixnio.com/nature-landscapes/leaf-leaves/leafy-background
"Euglena Microorganisms Nutrition" by ep793 [CC0] (cropped) via Pixabay https://pixabay.com/illustrations/euglena-microorganisms-nutrition-2320760/
"Halobacteria" by NASA [Public Domain] (cropped) via Wikimedia Commons https://ca.m.wikipedia.org/wiki/Fitxer:Halobacteria.jpg
"Under a very high magnification of 20000X, this colorized scanning electron micrograph (SEM) revealed the presence of a single Gram-negative" by CDC/ Bette Jensen [Public Domain] (cropped) via Public Domain Files http://www.publicdomainfiles.com/show_file.php?id=13489041618725
"Insects Various Insect" by divotomezove [CC0] (cropped) via Pixabay https://pixabay.com/photos/insects-various-insect-bug-bugs-3700843/
"Snail Shell Slowly" by Momental [CC0] (no alterations) via Pixabay https://pixabay.com/photos/snail-shell-slowly-crawl-animal-2594139/
"Lemur Ring Tailed Primate" by skeeze [CC0] (cropped) via Pixabay https://pixabay.com/photos/lemur-ring-tailed-lemur-primate-1045220/
"Kingfisher Bird Blue" by timoschluter [CC0] (cropped) via Pixabay https://pixabay.com/photos/kingfisher-bird-blue-plumage-1905255/

Archaea/archaebacteria
"Turtle Tortoise Sea" by kormandallas [CC0] (cropped) via Pixabay https://pixabay.com/photos/turtle-tortoise-sea-immersion-deep-2250720/
"Fungus Forest Mushroom" by HeyouRelax [CC0] (cropped) via Pixabay https://pixabay.com/photos/fungus-forest-mushroom-wild-2158028/
"leafy, background" by Leon Brooks [Public Domain] (cropped) via Pixnio https://pixnio.com/nature-landscapes/leaf-leaves/leafy-background
"Euglena Microorganisms Nutrition" by ep793 [CC0] (cropped) via Pixabay https://pixabay.com/illustrations/euglena-microorganisms-nutrition-2320760/
"Halobacteria" by NASA [Public Domain] (cropped) via Wikimedia Commons https://ca.m.wikipedia.org/wiki/Fitxer:Halobacteria.jpg
"Under a very high magnification of 20000X, this colorized scanning electron micrograph (SEM) revealed the presence of a single Gram-negative" by CDC/ Bette Jensen [Public Domain] (cropped) via Public Domain Files http://www.publicdomainfiles.com/show_file.php?id=13489041618725
"Champagne vent white smokers" by NOAA [Public Domain] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Champagne_vent_white_smokers.jpg
"Grand prismatic spring" by Jim Peaco, National Park Service [Public Domain] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Grand_prismatic_spring.jpg

asexual reproduction
"Turtle Tortoise Sea" by kormandallas [CC0] (cropped) via Pixabay https://pixabay.com/photos/turtle-tortoise-sea-immersion-deep-2250720/
"Fungus Forest Mushroom" by HeyouRelax [CC0] (cropped) via Pixabay https://pixabay.com/photos/fungus-forest-mushroom-wild-2158028/
"leafy, background" by Leon Brooks [Public Domain] (cropped) via Pixnio https://pixnio.com/nature-landscapes/leaf-leaves/leafy-background
"Euglena Microorganisms Nutrition" by ep793 [CC0] (cropped) via Pixabay https://pixabay.com/illustrations/euglena-microorganisms-nutrition-2320760/
"Halobacteria" by NASA [Public Domain] (cropped) via Wikimedia Commons https://ca.m.wikipedia.org/wiki/Fitxer:Halobacteria.jpg
"Under a very high magnification of 20000X, this colorized scanning electron micrograph (SEM) revealed the presence of a single Gram-negative" by CDC/ Bette Jensen [Public Domain] (cropped) via Public Domain Files http://www.publicdomainfiles.com/show_file.php?id=13489041618725

asteroid
"Solar System Planet Planetary" by WikiImages [CC0] (no alterations) via Pixabay https://pixabay.com/illustrations/solar-system-planet-planetary-system-11111/
"Asteroid Meteorite Comet Shooting" by WikiImages [CC0] (cropped) via Pixabay https://pixabay.com/photos/asteroid-meteorite-comet-63125/

asthenosphere
"Earth Globe Planet" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/earth-globe-planet-world-147591/
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/hot-temperature-thermometer-weather-159386/
"Lava Background Magma" by EriktheGreat [CC0] (cropped and brightened) via Pixabay https://pixabay.com/illustrations/lava-background-magma-nature-hot-499891/
"Húsafell Stone" by Pudpon [CC0 1.0] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:H%C3%BAsafell_Stone.png

atmosphere
"Earth Globe Planet" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/earth-globe-planet-world-147591/
"Zelkova Serrata Tree Bonsai" by Deedster [CC0] (cropped and rotated) via Pixabay https://pixabay.com/en/zelkova-serrata-tree-bonsai-zelkova-1613784/

autotroph
"Turtle Tortoise Sea" by kormandallas [CC0] (cropped) via Pixabay https://pixabay.com/photos/turtle-tortoise-sea-immersion-deep-2250720/
"Fungus Forest Mushroom" by HeyouRelax [CC0] (cropped) via Pixabay https://pixabay.com/photos/fungus-forest-mushroom-wild-2158028/
"leafy, background" by Leon Brooks [Public Domain] (cropped) via Pixnio https://pixnio.com/nature-landscapes/leaf-leaves/leafy-background
"Euglena Microorganisms Nutrition" by ep793 [CC0] (cropped) via Pixabay https://pixabay.com/illustrations/euglena-microorganisms-nutrition-2320760/
"Halobacteria" by NASA [Public Domain] (cropped) via Wikimedia Commons https://ca.m.wikipedia.org/wiki/Fitxer:Halobacteria.jpg
"Under a very high magnification of 20000X, this colorized scanning electron micrograph (SEM) revealed the presence of a single Gram-negative" by CDC/ Bette Jensen [Public Domain] (cropped) via Public Domain Files http://www.publicdomainfiles.com/show_file.php?id=13489041618725
"CSIRO ScienceImage 4203 A bluegreen algae species Cylindrospermum sp under magnification" by Willem van Aken, CSIRO [CC BY 3.0] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:CSIRO_ScienceImage_4203_A_bluegreen_algae_species_Cylindrospermum_sp_under_magnification.jpg

average speed
"Automobile Car Red" by OpenClipart-Vectors [CC0] (transparency filter applied) via Pixabay https://pixabay.com/vectors/automobile-car-red-french-old-1300467/
"Stopwatch Racing Timer" by OpenClipart-Vectors [CC0] (second hand removed) via Pixabay https://pixabay.com/vectors/stopwatch-racing-timer-timing-153398/

bacteria
"Soil Earth Excavation" by OpenClipart-Vectors [CC0] (recolored and cropped) via Pixabay https://pixabay.com/vectors/soil-earth-excavation-exposed-575643/
"bacteria illness bacterium infection" by Unknown [CC0] (recolored) via SVG Silh https://svgsilh.com/image/156869.html
"DNA Infection Bacteria Bacterium Virus Cell" by Unknown [CC0] (recolored) via Max Pixel https://www.maxpixel.net/Dna-Infection-Bacteria-Bacterium-Virus-Cell-213708
"EscherichiaColi NIAID" by Rocky Mountain Laboratories, NIAID, NIH [Public Domain] (recolored) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:EscherichiaColi_NIAID.jpg
"Human body silhouette" by Mikael Häggström [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Human_body_silhouette.svg
"Dicotyledoneae Asteraceae herb - root system, primary root becomes tap root and lateral roots" by RoRo [CC0 1.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Dicotyledoneae_Asteraceae_herb_-_root_system,_primary_root_becomes_tap_root_and_lateral_roots.JPG
"Turtle Tortoise Sea" by kormandallas [CC0] (cropped) via Pixabay https://pixabay.com/photos/turtle-tortoise-sea-immersion-deep-2250720/
"Fungus Forest Mushroom" by HeyouRelax [CC0] (cropped) via Pixabay https://pixabay.com/photos/fungus-forest-mushroom-wild-2158028/
"leafy, background" by Leon Brooks [Public Domain] (cropped) via Pixnio https://pixnio.com/nature-landscapes/leaf-leaves/leafy-background
"Euglena Microorganisms Nutrition" by ep793 [CC0] (cropped) via Pixabay https://pixabay.com/illustrations/euglena-microorganisms-nutrition-2320760/
"Halobacteria" by NASA [Public Domain] (cropped) via Wikimedia Commons https://ca.m.wikipedia.org/wiki/Fitxer:Halobacteria.jpg
"Under a very high magnification of 20000X, this colorized scanning electron micrograph (SEM) revealed the presence of a single Gram-negative" by CDC/ Bette Jensen [Public Domain] (cropped) via Public Domain Files http://www.publicdomainfiles.com/show_file.php?id=13489041618725

balanced force
"Crate Box Wooden" by Clker-Free-Vector-Images [CC0] (elongated) via Pixabay https://pixabay.com/vectors/crate-box-wooden-container-package-310787/
"Push Pushing Move Moving" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/push-pushing-move-moving-action-150175/
"Speedometer Tachometer Gauge" by OpenClipart-Vectors [CC0] (needle removed) via Pixabay https://pixabay.com/vectors/speedometer-tachometer-gauge-mph-153399/
"Automobile Car Red" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/automobile-car-red-french-old-1300467/

biofuels
"Compost Garbage Biological" by Couleur [CC0] (cropped) via Pixabay https://pixabay.com/photos/compost-garbage-biological-waste-3663514/
"bacterium h bacterium" by Unknown [CC0] (no alterations) via SVG Silh https://svgsilh.com/image/1455818.html
"bacteria illness bacterium infection" by Unknown [CC0] (no alterations) via SVG Silh https://svgsilh.com/image/156869.html
"Beaker Chemistry Empty" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/beaker-chemistry-empty-glasswares-159174/
"Oil Olive Greek" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/oil-olive-oil-greek-italian-olive-159855/
"Alga Algae Marine" by OpenClipart-Vectors [CC0] (rotated) via Pixabay https://pixabay.com/vectors/alga-algae-marine-ocean-plant-sea-1299962/

biomass
"Rabbit Silhouette Black Isolated" by Gorkhs [CC0] (no alterations) via Pixabay https://pixabay.com/en/rabbit-silhouette-black-2262101/
"Zelkova Serrata Tree Bonsai" by Deedster [CC0] (cropped and rotated) via Pixabay https://pixabay.com/en/zelkova-serrata-tree-bonsai-zelkova-1613784/
"Forest Trees Evergreen" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/forest-trees-evergreen-conifers-310072/
"Beaver Animal Rodent" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/beaver-animal-rodent-standing-tail-48437/
"Moose Large Body" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/moose-large-body-animal-mammal-48465/
"Dandelion Flower Yellow" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/dandelion-flower-yellow-plant-weed-31406/
"Bird Silhouette Flying" by Elionas [CC0] (no alterations) via Pixabay https://pixabay.com/en/bird-silhouette-flying-movement-1314469/
"Caterpillar Monarch Butterfly" by OpenClipart-Vectors [CC0] (rotated) via Pixabay https://pixabay.com/en/caterpillar-monarch-butterfly-156937/
"Cougar Mountain Lion" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/cougar-mountain-lion-wild-animal-47667/
"Bird" by yves_guillou (OCAL) [Public Domain] (no alterations) via Free Stock Photos http://www.freestockphotos.biz/stockphoto/15184
"Scales Kitchen Weighing" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/scales-kitchen-scales-weighing-35902/

biotic
"Development Germinating" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/en/development-germinating-germination-1300176/
"Elephant Animal Trunk" by Clker-Free-Vector-Images [CC0] (cropped) via Pixabay https://pixabay.com/en/elephant-animal-trunk-tusks-large-48423/
"Bones Bleached White" by holmespj [CC0] (cropped) via Pixabay https://pixabay.com/photos/bones-bleached-white-death-drought-3670740/
"Ink Red Splatter" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/ink-red-splatter-abstract-paint-303244/

brittle
"Euro 5 cent (Common face) (5131629928)" Mark Morgan [CC BY 2.0] (background removed) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Euro_5_cent_(Common_face)_(5131629928).jpg
"Coin Money Specie" by fotoblend [CC0] (background removed) via Pixabay https://pixabay.com/photos/coin-money-specie-currency-2903302/
"Rubble Rocks Pile" by Jazella [CC0] (no alterations) via Pixabay https://pixabay.com/illustrations/rubble-rocks-pile-stones-junk-4283458/
"Hammer Build Tool" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/hammer-build-tool-handyman-306313/
"Charcoal Black Dark" by KenStock [CC0] (cropped) via Pixabay https://pixabay.com/illustrations/charcoal-black-dark-grill-fire-5184954/

carbon
"Zelkova Serrata Tree Bonsai" by Deedster [CC0] (cropped and rotated) via Pixabay https://pixabay.com/en/zelkova-serrata-tree-bonsai-zelkova-1613784/
"Soil Layer Exposed" by OpenClipart-Vectors [CC0] (cropped and recolored) via Pixabay https://pixabay.com/vectors/soil-layer-exposed-cover-grass-575641/
"Deer Silhouette Clipart" by Karen Arnold [CC0] (no alterations) via PublicDomainPictures https://www.publicdomainpictures.net/en/view-image.php?image=77626&picture=deer-silhouette-clipart
"L-asparagine-3D-balls" by Jynto and Ben Mills [Public Domain] (transparency added) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:L-asparagine-3D-balls.png
"Charcoal Garden Party Baking" by adonyig [CC0] (cropped and edges softened) via Pixabay https://pixabay.com/photos/charcoal-garden-party-baking-3550205/

cell
"Waterweed Plant Cell" by Vierschilling [CC0] (cropped) via Pixabay https://pixabay.com/photos/waterweed-plant-cell-mikroskopieren-1582259/

cementation
"Mountain Hill Rock" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/mountain-hill-rock-peak-barren-575618/
"Húsafell Stone" by Pudpon [CC0 1.0] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:H%C3%BAsafell_Stone.png
"Glue Bottle Orange" by Clker-Free-Vector-Images [CC0] (rotated) via Pixabay https://pixabay.com/vectors/glue-bottle-orange-blue-fluid-306757/

chemical change
"Beaker Chemistry Full" by OpenClipart-Vectors [CC0] (recolored) via Pixabay https://pixabay.com/vectors/beaker-chemistry-full-glasswares-159176/

chemical energy
"L-asparagine-3D-balls" by Jynto and Ben Mills [Public Domain] (transparency added) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:L-asparagine-3D-balls.png
"Battery Energy Power" by OpenClipart-Vectors [CC0] (rotated) via Pixabay https://pixabay.com/vectors/battery-energy-power-cell-156718/
"Carrot Orange" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/carrot-orange-carrot-vegetables-1299147/
"Human body silhouette" by Mikael Häggström [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Human_body_silhouette.svg

chemical formula
"Baking Soda Box White" by evitaochel [CC0] (cropped) via Pixabay https://pixabay.com/photos/baking-soda-box-white-powder-768950/

chemical property
"Beaker Chemistry Full" by OpenClipart-Vectors [CC0] (recolored) via Pixabay https://pixabay.com/vectors/beaker-chemistry-full-glasswares-159176/
"Fire Flames Hell" by Clker-Free-Vector-Images [CC0] (stretched and rotated) via Pixabay https://pixabay.com/vectors/fire-flames-hell-burn-bright-307336/
"Explosions Pictogram Caution" by Clker-Free-Vector-Images [CC0] (cropped) via Pixabay https://pixabay.com/vectors/explosions-pictogram-caution-danger-28712/
"Fire Flame Flammable" by OpenIcons [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/flame-fire-flammable-inflammable-98645/
"Warning Corrosive Yellow Attention Acid Sign" by unknown [CC0] (no alterations) via Max Pixel https://www.maxpixel.net/Warning-Corrosive-Yellow-Attention-Acid-Sign-98647
"Match Burning Fire" by Clker-Free-Vector-Images [CC0] (rotated and darkened) via Pixabay https://pixabay.com/vectors/match-burning-fire-lit-matchstick-30271/

chemical reaction
"Beaker Chemistry Full" by OpenClipart-Vectors [CC0] (recolored) via Pixabay https://pixabay.com/vectors/beaker-chemistry-full-glasswares-159176/

chemical symbol
This image was created solely by Stephen Fleenor, PhD (Seidlitz Education)

comet
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/hot-temperature-thermometer-weather-159386/
"Space Stars Comet" by Buddy_Nath [CC0] (cropped) via Pixabay https://pixabay.com/illustrations/space-stars-comet-astronomy-1486556/
"Ice Crystal Chunks Of" by Hans [CC0] (cropped) via Pixabay https://pixabay.com/photos/ice-ice-crystal-chunks-of-ice-4444978/

community
"Rabbit Silhouette Black Isolated" by Gorkhs [CC0] (recolored) via Pixabay https://pixabay.com/en/rabbit-silhouette-black-2262101/
"Moose Large Body" by Clker-Free-Vector-Images [CC0] (recolored) via Pixabay https://pixabay.com/en/moose-large-body-animal-mammal-48465/
"Caterpillar Monarch Butterfly" by OpenClipart-Vectors [CC0] (recolored) via Pixabay https://pixabay.com/en/caterpillar-monarch-butterfly-156937/

compaction
"Mountain Hill Rock" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/mountain-hill-rock-peak-barren-575618/
"Húsafell Stone" by Pudpon [CC0 1.0] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:H%C3%BAsafell_Stone.png

composition
"Drinks Lemon Ade Cool" by eommina [CC0] (no alterations) via Pixabay https://pixabay.com/photos/drinks-lemon-ade-cool-lemonade-1825702/
"Water Glass Drip" by boristrost [CC0] (no alterations) via Pixabay https://pixabay.com/photos/water-glass-drip-drink-clear-1585192/
"Salt Cooking Rock Salt" by moritz320 [CC0] (cropped) via Pixabay https://pixabay.com/photos/salt-cooking-salt-rock-salt-4418749/
"Lemons Yellow Food" by Richardjohn [CC0] (no alterations) via Pixabay https://pixabay.com/photos/lemons-yellow-food-fruit-fresh-2039830/
"Bricks Concrete Rock" by Pexels [CC0] (no alterations) via Pixabay https://pixabay.com/photos/bricks-concrete-rock-stone-1839553/
"Brick Wall Brickwork White" MabelAmber [CC0] (no alterations) via Pixabay https://pixabay.com/photos/brick-wall-wall-brickwork-3079574/

compositional layers
"Earth Globe Planet" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/earth-globe-planet-world-147591/
"Húsafell Stone" by Pudpon [CC0 1.0] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:H%C3%BAsafell_Stone.png
"Afwillite on rock Hydrous calcium silicate Crestmore Quarry Riverside California" by Dave Dyet [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Afwillite_on_rock_Hydrous_calcium_silicate_Crestmore_Quarry_Riverside_California.jpg
"Pyrite pyrites mineral" by stux [CC0] (no alterations) via Pixabay https://pixabay.com/photos/pyrite-pyrites-mineral-sulfide-345637/

compound
"Baking Soda Box White" by evitaochel [CC0] (cropped) via Pixabay https://pixabay.com/photos/baking-soda-box-white-powder-768950/
"Water Glass Drip" by boristrost [CC0] (no alterations) via Pixabay https://pixabay.com/photos/water-glass-drip-drink-clear-1585192/
"Petrol Equipment Fire Extinguisher" by GulArt [CC0] (cropped) via Pixabay https://pixabay.com/photos/petrol-equipment-fire-extinguisher-3079094/

conduction/conduct
"Light Bulb Lightbulb" by Clker-Free-Vector-Images [CC0] (rotated) via Pixabay https://pixabay.com/vectors/light-bulb-lightbulb-light-bulb-34547/
"Battery Energy Power" by OpenClipart-Vectors [CC0] (rotated) via Pixabay https://pixabay.com/vectors/battery-energy-power-cell-156718/
"cooking, pot, kitchen, stainless, steel, stove" by Marcelo [Public Domain] (cropped) via Pixnio https://pixnio.com/objects/cooking-pot-on-the-kitchen-stove

conductivity
"Sulfur-sample" by Ben Mills [Public Domain] (background removed) via Wikimedia Commons https://en.wikipedia.org/wiki/File:Sulfur-sample.jpg
"5 B Boron" by Hi-Res Images of Chemical Elements [CC BY 3.0] (background removed) via Images-of-Elements http://images-of-elements.com/boron.php
"Gold Nugget Natural" by PIX1861 [CC0] (background removed) via Pixabay https://pixabay.com/photos/gold-nugget-gold-nugget-2269846/

conservation
"Pond Water Outdoor" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/pond-water-outdoor-grass-outdoors-310149/
"Forest Trees Oak" by Clker-Free-Vector-Images [CC0] (recolored and cropped) via Pixabay https://pixabay.com/vectors/forest-trees-oak-fir-pine-spruce-31910/
"Trucks Flatbed Trucking" by Clker-Free-Vector-Images [CC0] (cropped, recolored and rotated) via Pixabay https://pixabay.com/vectors/trucks-flatbed-trucking-vehicle-308567/
"Seedling Potted Plant Sapling" by OpenClipart-Vectors [CC0] (rotated and brightness adjusted) via Pixabay https://pixabay.com/vectors/seedling-potted-plant-sapling-plant-154735/
"Truck Box Car" by 200degrees [CC0] (cropped and recolored) via Pixabay https://pixabay.com/vectors/truck-box-car-vehicle-delivery-2181037/
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/

constant speed
"Stopwatch Racing Timer" by OpenClipart-Vectors [CC0] (second hand removed) via Pixabay https://pixabay.com/vectors/stopwatch-racing-timer-timing-153398/
"Speedometer Tachometer Gauge" by OpenClipart-Vectors [CC0] (needle removed) via Pixabay https://pixabay.com/vectors/speedometer-tachometer-gauge-mph-153399/
"Automobile Car Red" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/automobile-car-red-french-old-1300467/

convection
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (temperature changed) via Pixabay https://pixabay.com/vectors/hot-temperature-thermometer-weather-159386/
"Wind Energy Renewable" by OpenClipart-Vectors [CC0] (cropped and recolored) via Pixabay https://pixabay.com/vectors/wind-energy-renewable-energy-wind-2029621/

convergent boundary
"Lava Background Magma" by EriktheGreat [CC0] (cropped and brightened) via Pixabay https://pixabay.com/illustrations/lava-background-magma-nature-hot-499891/

crust
"Earth Globe Planet" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/earth-globe-planet-world-147591/

dense/density
"Stone Rock" by kalhh [CC0] (cropped) via Pixabay https://pixabay.com/illustrations/stone-rock-isolated-2010928/
"Pumice Stone and Rusty Bar" by Circe Denyer [CC0] (cropped) via PublicDomainPictures https://www.publicdomainpictures.net/en/view-image.php?image=244684&picture=pumice-stone-and-rusty-bar
"Beaker Chemistry Full" by OpenClipart-Vectors [CC0] (contrast adjusted, transparency filter added, and water level changed) via Pixabay https://pixabay.com/vectors/beaker-chemistry-full-glasswares-159176/
"Balance Scale Weight" by OpenClipart-Vectors [CC0] (recolored) via Pixabay https://pixabay.com/vectors/balance-scale-weight-kitchen-154266/
"Weights Kilogram Kilo" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/weights-kilogram-kilo-metal-mass-157664/

deposition
"Beach Desert Dune Sand" by OpenClipart-Vectors [CC0] (dune erased) via Pixabay https://pixabay.com/vectors/beach-desert-dune-sand-157340/
"Wind Energy Renewable" by OpenClipart-Vectors [CC0] (cropped and recolored) via Pixabay https://pixabay.com/vectors/wind-energy-renewable-energy-wind-2029621/
"Húsafell Stone" by Pudpon [CC0 1.0] (cropped and recolored) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:H%C3%BAsafell_Stone.png

displacement
"Automobile Car Red" by OpenClipart-Vectors [CC0] (transparency filter applied) via Pixabay https://pixabay.com/vectors/automobile-car-red-french-old-1300467/

distance
"Automobile Car Red" by OpenClipart-Vectors [CC0] (transparency filter applied) via Pixabay https://pixabay.com/vectors/automobile-car-red-french-old-1300467/

divergent boundary
"Lava Background Magma" by EriktheGreat [CC0] (cropped and brightened) via Pixabay https://pixabay.com/illustrations/lava-background-magma-nature-hot-499891/

ductile/ductility
"Hand Fingers Grip" by OpenClipart-Vectors [CC0] (cropped and recolored) via Pixabay https://pixabay.com/vectors/hand-fingers-grip-grasp-seize-149680/
"rope wing steel wire" by Unknown [CC0] (background removed and stretched) via Pxhere https://pxhere.com/en/photo/766047
"Circular Plates Metal" by artbaggage [CC0] (no alterations) via Pixabay https://pixabay.com/illustrations/circular-plates-metal-iron-837510/

earthquake
"Apartment Houses Brick" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/apartment-houses-brick-buildings-159414/

ecosystem
"Rabbit Silhouette Black Isolated" by Gorkhs [CC0] (recolored) via Pixabay https://pixabay.com/en/rabbit-silhouette-black-2262101/
"Moose Large Body" by Clker-Free-Vector-Images [CC0] (recolored) via Pixabay https://pixabay.com/en/moose-large-body-animal-mammal-48465/
"Caterpillar Monarch Butterfly" by OpenClipart-Vectors [CC0] (recolored) via Pixabay https://pixabay.com/en/caterpillar-monarch-butterfly-156937/
"Pond Water Outdoor" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/pond-water-outdoor-grass-outdoors-310149/
"Cougar Mountain Lion" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/cougar-mountain-lion-wild-animal-47667/

electric current
"Light Bulb Lightbulb" by Clker-Free-Vector-Images [CC0] (rotated and cropped) via Pixabay https://pixabay.com/vectors/light-bulb-lightbulb-light-bulb-34547/
"Battery Energy Power" by OpenClipart-Vectors [CC0] (rotated) via Pixabay https://pixabay.com/vectors/battery-energy-power-cell-156718/

electrical energy
"Socket Wall Electric" by Clker-Free-Vector-Images [CC0] (background removed) via Pixabay https://pixabay.com/vectors/socket-wall-electric-power-plug-33137/
"Power Station Current The Industry" by JerryGorecki [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/power-station-current-the-industry-3664263/
"Solar Panel Photovoltaic" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/solar-panel-photovoltaic-solar-cells-303455/
"Wind Turbine Energy" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/wind-turbine-wind-energy-electricity-297804/
"Building House Home" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/building-house-home-construction-295215/
"Utility Pole Electrical Tower" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/utility-pole-electrical-tower-296441/

element
Untitled by unknown [CC0] (no alterations) via Pxhere https://pxhere.com/en/photo/666730

elliptical orbit
"Jupiter Planet Space" by TheDigitalArtist [CC0] (no alterations) via Pixabay https://pixabay.com/illustrations/jupiter-planet-space-astronomy-942558/

energy conversion/transformation
"Beaker Experiment Bubbles" by OpenClipart-Vectors [CC0] (recolored) via Pixabay https://pixabay.com/vectors/beaker-experiment-bubbles-chemistry-148167/
"Light Bulb Lightbulb" by Clker-Free-Vector-Images [CC0] (rotated) via Pixabay https://pixabay.com/vectors/light-bulb-lightbulb-light-bulb-34547/
"Battery Energy Power" by OpenClipart-Vectors [CC0] (rotated) via Pixabay https://pixabay.com/vectors/battery-energy-power-cell-156718/
"Carrot Orange" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/carrot-orange-carrot-vegetables-1299147/
"Silhouette Running Run" by mohammed_hassan [CC0] (rotated) via Pixabay https://pixabay.com/vectors/silhouette-running-run-fast-3199472/

equilibrium
"Rabbit Silhouette Black Isolated" by Gorkhs [CC0] (recolored) via Pixabay https://pixabay.com/en/rabbit-silhouette-black-2262101/
"Cougar Mountain Lion" by Clker-Free-Vector-Images [CC0] (recolored) via Pixabay https://pixabay.com/en/cougar-mountain-lion-wild-animal-47667/

erosion
"Mountain Hill Rock" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/mountain-hill-rock-peak-barren-575618/
"Wind Energy Renewable" by OpenClipart-Vectors [CC0] (cropped and recolored) via Pixabay https://pixabay.com/vectors/wind-energy-renewable-energy-wind-2029621/
"Cloud Overcast Weather" by OpenClipat-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/cloud-overcast-weather-159388/
"Rain Cloud Nature" by Clker-Free-Vector-Images [CC0] (cropped) via Pixabay https://pixabay.com/vectors/rain-cloud-nature-weather-sky-310148/

Eubacteria
"Turtle Tortoise Sea" by kormandallas [CC0] (cropped) via Pixabay https://pixabay.com/photos/turtle-tortoise-sea-immersion-deep-2250720/
"Fungus Forest Mushroom" by HeyouRelax [CC0] (cropped) via Pixabay https://pixabay.com/photos/fungus-forest-mushroom-wild-2158028/
"leafy, background" by Leon Brooks [Public Domain] (cropped) via Pixnio https://pixnio.com/nature-landscapes/leaf-leaves/leafy-background
"Euglena Microorganisms Nutrition" by ep793 [CC0] (cropped) via Pixabay https://pixabay.com/illustrations/euglena-microorganisms-nutrition-2320760/
"Halobacteria" by NASA [Public Domain] (cropped) via Wikimedia Commons https://ca.m.wikipedia.org/wiki/Fitxer:Halobacteria.jpg
"Under a very high magnification of 20000X, this colorized scanning electron micrograph (SEM) revealed the presence of a single Gram-negative" by CDC/ Bette Jensen [Public Domain] (cropped) via Public Domain Files http://www.publicdomainfiles.com/show_file.php?id=13489041618725
"Soil Earth Excavation" by OpenClipart-Vectors [CC0] (recolored and cropped) via Pixabay https://pixabay.com/vectors/soil-earth-excavation-exposed-575643/
"Human body silhouette" by Mikael Häggström [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Human_body_silhouette.svg

eukaryote
"Turtle Tortoise Sea" by kormandallas [CC0] (cropped) via Pixabay https://pixabay.com/photos/turtle-tortoise-sea-immersion-deep-2250720/
"Fungus Forest Mushroom" by HeyouRelax [CC0] (cropped) via Pixabay https://pixabay.com/photos/fungus-forest-mushroom-wild-2158028/
"leafy, background" by Leon Brooks [Public Domain] (cropped) via Pixnio https://pixnio.com/nature-landscapes/leaf-leaves/leafy-background
"Euglena Microorganisms Nutrition" by ep793 [CC0] (cropped) via Pixabay https://pixabay.com/illustrations/euglena-microorganisms-nutrition-2320760/
"Halobacteria" by NASA [Public Domain] (cropped) via Wikimedia Commons https://ca.m.wikipedia.org/wiki/Fitxer:Halobacteria.jpg
"Under a very high magnification of 20000X, this colorized scanning electron micrograph (SEM) revealed the presence of a single Gram-negative" by CDC/ Bette Jensen [Public Domain] (cropped) via Public Domain Files http://www.publicdomainfiles.com/show_file.php?id=13489041618725
"Koli Bacteria Escherichia Coli" by geralt [CC0] (no alterations) via Pixabay https://pixabay.com/photos/koli-bacteria-escherichia-coli-123081/

force
"Magnet Magnetic Poles Magnetism" by Clker-Free-Vector-Images [CC0] (rotated) via Pixabay https://pixabay.com/vectors/magnet-magnetic-poles-magnetism-297698/
"Tree Apple" by Kjristie [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/tree-apple-apple-tree-nature-fruit-923776/
"Apple Red Fruit" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/apple-red-fruit-vitamins-healthy-158419/
"Crate Box Wooden" by Clker-Free-Vector-Images [CC0] (elongated) via Pixabay https://pixabay.com/vectors/crate-box-wooden-container-package-310787/
"Push Pushing Move Moving" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/push-pushing-move-moving-action-150175/
"Silhouette Relationship Conflict" by mohamed_hassan [CC0] (cropped) via Pixabay https://pixabay.com/vectors/silhouette-relationship-conflict-3141264/

Fungi
"Turtle Tortoise Sea" by kormandallas [CC0] (cropped) via Pixabay https://pixabay.com/photos/turtle-tortoise-sea-immersion-deep-2250720/
"Fungus Forest Mushroom" by HeyouRelax [CC0] (cropped) via Pixabay https://pixabay.com/photos/fungus-forest-mushroom-wild-2158028/
"leafy, background" by Leon Brooks [Public Domain] (cropped) via Pixnio https://pixnio.com/nature-landscapes/leaf-leaves/leafy-background
"Euglena Microorganisms Nutrition" by ep793 [CC0] (cropped) via Pixabay https://pixabay.com/illustrations/euglena-microorganisms-nutrition-2320760/
"Halobacteria" by NASA [Public Domain] (cropped) via Wikimedia Commons https://ca.m.wikipedia.org/wiki/Fitxer:Halobacteria.jpg
"Under a very high magnification of 20000X, this colorized scanning electron micrograph (SEM) revealed the presence of a single Gram-negative" by CDC/ Bette Jensen [Public Domain] (cropped) via Public Domain Files http://www.publicdomainfiles.com/show_file.php?id=13489041618725
"Unusual Bracket Fungi Yellow" by GeorgeB2 [CC0] (cropped) via Pixabay https://pixabay.com/photos/unusual-bracket-fungi-yellow-rust-3811395/
"Lemon Rotten Fruit" by dimitrisvetsikas1969 [CC0] (cropped) via Pixabay https://pixabay.com/photos/lemon-rotten-fruit-yellow-green-2146987/

geothermal
"Beverage Container Kitchen" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/beverage-container-kitchen-teapot-1300298/
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (temperature changed) via Pixabay https://pixabay.com/vectors/hot-temperature-thermometer-weather-159386/
"Industry Factories Buildings" by Clker-Free-Vector-Images [CC0] (cropped) via Pixabay https://pixabay.com/vectors/industry-factories-buildings-33663/

gravity
"Pilates Pilate Ball" by CoxinhaFotos [CC0] (cropped, recolored, and brightness adjusted) via Pixabay https://pixabay.com/vectors/pilates-pilate-ball-sphere-2137509/
"Grass Meadow Green" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/grass-meadow-green-agriculture-159804/
"Lifting Box Wood" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/lifting-box-wood-heavy-crate-24401/

hardness
"Hammer Build Tool" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/hammer-build-tool-handyman-306313/
"Nail Hammer Tool" by OpenClipart-Vectors [CC0] (cropped and rotated) via Pixabay https://pixabay.com/vectors/nail-hammer-tool-build-carpentry-147247/
"Diamond Shiny Baby" by EWAR [CC0] (background removed) via Pixabay https://pixabay.com/illustrations/diamond-shiny-baby-wealth-wealthy-807979/
"Fluorite with Iron Pyrite" by Ryan Bushby [CC BY 2.5] (background removed) via Wikimedia Commons https://en.wikipedia.org/wiki/File:Fluorite_with_Iron_Pyrite.jpg
"Talc block" by Sanao [Public Domain] (background removed) via Wikimedia Commons https://en.wikipedia.org/wiki/File:Talc_block.jpg

heterotroph
"Turtle Tortoise Sea" by kormandallas [CC0] (cropped) via Pixabay https://pixabay.com/photos/turtle-tortoise-sea-immersion-deep-2250720/
"Fungus Forest Mushroom" by HeyouRelax [CC0] (cropped) via Pixabay https://pixabay.com/photos/fungus-forest-mushroom-wild-2158028/
"leafy, background" by Leon Brooks [Public Domain] (cropped) via Pixnio https://pixnio.com/nature-landscapes/leaf-leaves/leafy-background
"Euglena Microorganisms Nutrition" by ep793 [CC0] (cropped) via Pixabay https://pixabay.com/illustrations/euglena-microorganisms-nutrition-2320760/
"Halobacteria" by NASA [Public Domain] (cropped) via Wikimedia Commons https://ca.m.wikipedia.org/wiki/Fitxer:Halobacteria.jpg
"Under a very high magnification of 20000X, this colorized scanning electron micrograph (SEM) revealed the presence of a single Gram-negative" by CDC/ Bette Jensen [Public Domain] (cropped) via Public Domain Files http://www.publicdomainfiles.com/show_file.php?id=13489041618725
"Cougar Mountain Lion" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/cougar-mountain-lion-wild-animal-47667/
"Rabbit Silhouette Black Isolated" by Gorkhs [CC0] (no alterations) via Pixabay https://pixabay.com/en/rabbit-silhouette-black-2262101/
"Dandelion Flower Yellow" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/dandelion-flower-yellow-plant-weed-31406/
"Mushroom Cartoon Fungus" by basker_Dhandapani [CC0] (no alterations) via Pixabay https://pixabay.com/illustrations/mushroom-cartoon-fungus-vegetable-2844146/

hydropower
"Japan Nagano Krobe" by funario [CC0] (cropped) via Pixabay https://pixabay.com/photos/japan-nagano-krobe-dam-2039620/
"Beverage Container Kitchen" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/beverage-container-kitchen-teapot-1300298/
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (temperature changed) via Pixabay https://pixabay.com/vectors/hot-temperature-thermometer-weather-159386/

igneous rock
"Lava Background Magma" by EriktheGreat [CC0] (cropped and brightened) via Pixabay https://pixabay.com/illustrations/lava-background-magma-nature-hot-499891/
"Rocks Stone Nature" by Msaeedsalem [CC0] (cropped) via Pixabay https://pixabay.com/photos/rocks-stone-nature-isolated-2491924/
"Ground rhyolite" by Doronenko [CC BY 3.0] (background removed) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Ground_rhyolite.jpg
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (temperature changed) via Pixabay https://pixabay.com/vectors/hot-temperature-thermometer-weather-159386/

inclined plane
"Crate Box Wooden" by Clker-Free-Vector-Images [CC0] (elongated) via Pixabay https://pixabay.com/vectors/crate-box-wooden-container-package-310787/
"Push Pushing Move Moving" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/push-pushing-move-moving-action-150175/

inner core
"Earth Globe Planet" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/earth-globe-planet-world-147591/
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (temperature changed) via Pixabay https://pixabay.com/vectors/hot-temperature-thermometer-weather-159386/
"Lava Background Magma" by EriktheGreat [CC0] (cropped and brightened) via Pixabay https://pixabay.com/illustrations/lava-background-magma-nature-hot-499891/
"Metal Balls Bearings" by LeoNeoBoy [CC0] (cropped) via Pixabay https://pixabay.com/photos/metal-balls-bearings-round-silver-1816561/
"Magnet Physics Magnetism" by yeTis [CC0] (rotated) via Pixabay https://pixabay.com/illustrations/magnet-physics-magnetism-science-4683659/

kinetic energy
"Bouncing Jump Child" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/bouncing-jump-child-girl-159517/
"Wind Turbine Energy" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/wind-turbine-wind-energy-electricity-297804/
"Pilates Pilate Ball" by CoxinhaFotos [CC0] (cropped, recolored, and brightness adjusted) via Pixabay https://pixabay.com/vectors/pilates-pilate-ball-sphere-2137509/
"Hurry Up Sport Silhouette" by mohamed_hassan [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/hurry-up-sport-silhouette-speed-2785660/

lava
"Lava Background Magma" by EriktheGreat [CC0] (cropped and brightened) via Pixabay https://pixabay.com/illustrations/lava-background-magma-nature-hot-499891/
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (temperature changed) via Pixabay https://pixabay.com/vectors/hot-temperature-thermometer-weather-159386/

Law of Conservation of Energy
"Hand Fingers Grip" by OpenClipart-Vectors [CC0] (cropped and recolored) via Pixabay https://pixabay.com/vectors/hand-fingers-grip-grasp-seize-149680/
"Light Torch Lamp" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/light-torch-lamp-electric-159858/
"Pilates Pilate Ball" by CoxinhaFotos [CC0] (cropped, recolored, and brightness adjusted) via Pixabay https://pixabay.com/vectors/pilates-pilate-ball-sphere-2137509/
"Battery Energy Power" by OpenClipart-Vectors [CC0] (rotated) via Pixabay https://pixabay.com/vectors/battery-energy-power-cell-156718/
"Cross Skull Danger" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/cross-skull-danger-crossbones-296395/
"Explosion Pow Detonation" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/explosion-pow-detonation-bomb-boom-153710/

light energy
"Light Torch Lamp" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/light-torch-lamp-electric-159858/
"Zelkova Serrata Tree Bonsai" by Deedster [CC0] (cropped and rotated) via Pixabay https://pixabay.com/en/zelkova-serrata-tree-bonsai-zelkova-1613784/
"Solar Panel Photovoltaic" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/solar-panel-photovoltaic-solar-cells-303455/

lithosphere
"Earth Globe Planet" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/earth-globe-planet-world-147591/

luster
"Talc block" by Sanao [Public Domain] (background removed) via Wikimedia Commons https://en.wikipedia.org/wiki/File:Talc_block.jpg
"Graphite (Sri Lanka)" by James St. John [CC BY 2.0] (background removed) via Flickr https://www.flickr.com/photos/jsjgeology/17364736943
"Sierra Grande Andesite" by James St. John [CC BY 2.0] (background removed) via Flickr https://www.flickr.com/photos/jsjgeology/8455685503/sizes/o/in/set-72157632720256842/
"Pyrite Pyrites Fools Gold Iron" by fill [CC0] (background removed) via Pixabay https://pixabay.com/photos/pyrite-pyrites-fools-gold-626549/
"Light Torch Lamp" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/light-torch-lamp-electric-159858/

magma
"Lava Background Magma" by EriktheGreat [CC0] (cropped and brightened) via Pixabay https://pixabay.com/illustrations/lava-background-magma-nature-hot-499891/
"Húsafell Stone" by Pudpon [CC0 1.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:H%C3%BAsafell_Stone.png
"Earth Globe Planet" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/earth-globe-planet-world-147591/
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (temperature changed) via Pixabay https://pixabay.com/vectors/hot-temperature-thermometer-weather-159386/

magnetism
"Block Wooden Wood" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/block-wooden-wood-rectangular-575426/
"Magnet Physics Magnetism" by yeTis [CC0] (rotated) via Pixabay https://pixabay.com/illustrations/magnet-physics-magnetism-science-4683659/
"Magnet Physics Magnetism" by yeTis [CC0] (cropped) via Pixabay https://pixabay.com/illustrations/magnet-physics-magnetism-science-4708072/

malleability/malleable
"Hammer Build Tool" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/hammer-build-tool-handyman-306313/
"Gold Nugget Natural" by PIX1861 [CC0] (background removed) via Pixabay https://pixabay.com/photos/gold-nugget-gold-nugget-2269846/
"Sulfur-sample" by Ben Mills [Public Domain] (background removed) via Wikimedia Commons https://en.wikipedia.org/wiki/File:Sulfur-sample.jpg
"Soufre/Sulphur/sulfur" by ComputerHotline [CC BY 3.0] (cropped and rotated) via OpenPhoto https://openphoto.net/gallery/image/view/10670

mantle
"Earth Globe Planet" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/earth-globe-planet-world-147591/
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/hot-temperature-thermometer-weather-159386/
"Lava Background Magma" by EriktheGreat [CC0] (cropped and brightened) via Pixabay https://pixabay.com/illustrations/lava-background-magma-nature-hot-499891/

mass
"Scales Kitchen Weighing" by Clker-Free-Vector-Images [CC0] (dial rotated) via Pixabay https://pixabay.com/vectors/scales-kitchen-scales-weighing-35902/
"Pilates Pilate Ball" by CoxinhaFotos [CC0] (cropped, recolored, and brightness adjusted) via Pixabay https://pixabay.com/vectors/pilates-pilate-ball-sphere-2137509/
"Full Moon Bright" by dunc [CC0] (cropped) via Pixabay https://pixabay.com/photos/full-moon-moon-bright-sky-space-496873/
"The Earth Terrestrial Globe Planet" by janeb [CC0] (cropped) via Pixabay https://pixabay.com/illustrations/the-earth-terrestrial-globe-planet-1179212/
"Weights Kilogram Kilo" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/weights-kilogram-kilo-metal-mass-157664/
"Balance Scale Weight" by OpenClipart-Vectors [CC0] (recolored) via Pixabay https://pixabay.com/vectors/balance-scale-weight-kitchen-154266/

mechanical energy
"Forklift Lift Truck Industrial" by samuelchavelas [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/forklift-lift-truck-industrial-3337360/
"Wind Turbine Energy" by Clker-Free-Vector-Images [CC0] (cropped) via Pixabay https://pixabay.com/vectors/wind-turbine-wind-energy-electricity-297804/
"Applications-system" by The people from the Tango! Project [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Applications-system.svg

mechanical layers
"Earth Globe Planet" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/earth-globe-planet-world-147591/
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (temperature changed) via Pixabay https://pixabay.com/vectors/hot-temperature-thermometer-weather-159386/
"Lava Background Magma" by EriktheGreat [CC0] (cropped and brightened) via Pixabay https://pixabay.com/illustrations/lava-background-magma-nature-hot-499891/

metal
"Antimony (Mexico) 2" by James St. John [CC BY 2.0] (brightened) via Flickr https://www.flickr.com/photos/jsjgeology/17150760398
"Copper (29 Cu)" by Hi-Res Images of Chemical Elements [CC BY 3.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Copper_(29_Cu).jpg

metalloid
"5 B Boron" by Hi-Res Images of Chemical Elements [CC BY 3.0] (no alterations) via Images-of-Elements http://images-of-elements.com/boron.php

metamorphic rock
"Rocks Stone Nature" by Msaeedsalem [CC0] (cropped) via Pixabay https://pixabay.com/photos/rocks-stone-nature-isolated-2491924/
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (temperature changed) via Pixabay https://pixabay.com/vectors/hot-temperature-thermometer-weather-159386/
"Silica Carbonate Rock - Metamorphic Rock San Benito County California 1622" by Dave Dyet [Public Domain] (background removed) via Wikimedia Commons https://en.m.wikipedia.org/wiki/File:Silica_Carbonate_Rock_-_Metamorphic_Rock_San_Benito_County_California_1622.jpg
"Foliated metamorphic gneiss" by Tim Connors [Public Domain] (background removed) via National Park Service https://www.nps.gov/subjects/geology/metamorphic.htm
"Fossiliferous limestone (Tertiary; Florida, USA) 1 by James St. John [CC BY 2.0] (cropped) via Flickr https://www.flickr.com/photos/jsjgeology/24911425174

meteor
"Asteroid Meteorite Comet Shooting" by WikiImages [CC0] (cropped) via Pixabay https://pixabay.com/photos/asteroid-meteorite-comet-63125/
"Explosion Pow Detonation" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/explosion-pow-detonation-bomb-boom-153710/
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (temperature changed) via Pixabay https://pixabay.com/vectors/hot-temperature-thermometer-weather-159386/
"Dark Darkness Meteor" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/dark-darkness-meteor-night-2024127/

mid‐ocean ridge
"Lava Background Magma" by EriktheGreat [CC0] (cropped and brightened) via Pixabay https://pixabay.com/illustrations/lava-background-magma-nature-hot-499891/
"Húsafell Stone" by Pudpon [CC0 1.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:H%C3%BAsafell_Stone.png
"World Map" by Clker-Free-Vector-Images [[CC0] (no alterations) via Pixabay https://pixabay.com/vectors/world-map-world-map-earth-global-297315/
Untitled by NOAA [Public Domain] (no alterations) via NOAA https://oceanservice.noaa.gov/facts/midoceanridge.html
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (temperature changed) via Pixabay https://pixabay.com/vectors/hot-temperature-thermometer-weather-159386/

mineral
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (temperature changed) via Pixabay https://pixabay.com/vectors/hot-temperature-thermometer-weather-159386/
"Silica Carbonate Rock - Metamorphic Rock San Benito County California 1622" by Dave Dyet [Public Domain] (background removed) via Wikimedia Commons https://en.m.wikipedia.org/wiki/File:Silica_Carbonate_Rock_-_Metamorphic_Rock_San_Benito_County_California_1622.jpg
"Crystal Quartz Transparency" by uhi_noko812 [CC0] (background removed) via Pixabay https://pixabay.com/photos/crystal-quartz-transparency-stone-860840/

Moh’s Scale of Hardness
"Mohs" by National Park Service [Public Domain] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Mohs.jpg

motion/move/movement
"Boy Female Girl" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/boy-female-girl-human-jumping-2029800/
"Silhouette Black Jumping" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/silhouette-black-jumping-man-guy-32193/
"People Walking Silhouette" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/people-walking-silhouette-black-33483/
"Bouncing Jump Child" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/bouncing-jump-child-girl-159517/

multicellular
"Turtle Tortoise Sea" by kormandallas [CC0] (cropped) via Pixabay https://pixabay.com/photos/turtle-tortoise-sea-immersion-deep-2250720/
"Fungus Forest Mushroom" by HeyouRelax [CC0] (cropped) via Pixabay https://pixabay.com/photos/fungus-forest-mushroom-wild-2158028/
"leafy, background" by Leon Brooks [Public Domain] (cropped) via Pixnio https://pixnio.com/nature-landscapes/leaf-leaves/leafy-background
"Euglena Microorganisms Nutrition" by ep793 [CC0] (cropped) via Pixabay https://pixabay.com/illustrations/euglena-microorganisms-nutrition-2320760/
"Halobacteria" by NASA [Public Domain] (cropped) via Wikimedia Commons https://ca.m.wikipedia.org/wiki/Fitxer:Halobacteria.jpg
"Under a very high magnification of 20000X, this colorized scanning electron micrograph (SEM) revealed the presence of a single Gram-negative" by CDC/ Bette Jensen [Public Domain] (cropped) via Public Domain Files http://www.publicdomainfiles.com/show_file.php?id=13489041618725
"Trichia Decipiens Slime Mold Single Celled Organisms" by unknown [CC0 Public Domain] (cropped and brightened) via Max Pixel https://www.maxpixel.net/Trichia-Decipiens-Slime-Mold-Single-Celled-Organisms-2793201

nonmetal
"Sulfur-sample" by Ben Mills [Public Domain] (cropped) via Wikimedia Commons https://en.wikipedia.org/wiki/File:Sulfur-sample.jpg
"Arsenic (Andreasberg, Harz Mountains, Germany) 1" by James St. John [CC BY 2.0] (background removed) via Flickr https://www.flickr.com/photos/jsjgeology/17508918772

non-renewable resource
"Rubble Rocks Pile" by Jazella [CC0] (cropped) via Pixabay https://pixabay.com/illustrations/rubble-rocks-pile-stones-junk-4283458/
"Barrel Container Oil" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/barrel-container-oil-metal-drum-36724/
"Drilling Oil Rig" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/drilling-oil-rig-pump-petroleum-36265/
"Soil Earth Excavation" by OpenClipart-Vectors [CC0] (recolored and cropped) via Pixabay https://pixabay.com/vectors/soil-earth-excavation-exposed-575643/

nuclear power
"Explosion Pow Detonation" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/explosion-pow-detonation-bomb-boom-153710/
"Beverage Container Kitchen" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/beverage-container-kitchen-teapot-1300298/
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (temperature changed) via Pixabay https://pixabay.com/vectors/hot-temperature-thermometer-weather-159386/
"Power Plant Nuclear" by JamesQube [CC0] (cropped) via Pixabay https://pixabay.com/photos/power-plant-nuclear-power-2899861/
"Radioactivity Radioactive Symbol" by Clker-Free-Vector-Images [CC0] (cropped) via Pixabay https://pixabay.com/vectors/radioactivity-radioactive-symbol-35721/
*Energy output information from: https://www.energy.gov/ne/articles/nuclear-power-most-reliable-energy-source-and-its-not-even-close#:~:text=Nuclear%20Has%20The%20Highest%20Capacity%20Factor&text=This%20basically%20means%20nuclear%20power,than%20wind%20and%20solar%20plants.

nucleus (cellular)
"DNA mutation" by Mouagip [Public Domain] (recolored, cropped and labels removed) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:DNA_UV_mutation.svg
"Diagram human cell nucleus no text" by Mariana Ruiz Villareal LadyofHats and Peter Znamenskiy [Public Domain] (recolored and cropped) via Wikimedia Commons https://en.wikipedia.org/wiki/File:Diagram_human_cell_nucleus_no_text.png
"Icons Information Rodentia" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/icons-information-rodentia-icons-1294597/
"Onion cells" by kaibara87 [CC BY 2.0] (rotated) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Onion_Cells.jpg

ocean basin
"Húsafell Stone" by Pudpon [CC0 1.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:H%C3%BAsafell_Stone.png

orbit
"Earth Globe Planet" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/earth-globe-planet-world-147591/

organism
"Brown Bear Standing" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/brown-bear-standing-animal-fur-48446/
"Protozoan Microbes Biology" by dbutlerdidit [CC0] (no alterations) via Pixabay https://pixabay.com/illustrations/protozoans-microbes-biology-science-1450090/
"Zelkova Serrata Tree Bonsai" by Deedster [CC0] (cropped and rotated) via Pixabay https://pixabay.com/en/zelkova-serrata-tree-bonsai-zelkova-1613784/
"Beedle Insect Bug" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/beetle-insect-bug-blue-black-legs-34372/
"Stem Leaves Paris Parts Plant" by Unknown [CC0] (no alterations) via Max Pixel https://www.maxpixel.net/Stem-Leaves-Paris-Plants-Leaf-2082612
"Mushroom Cartoon Fungus" by basker_Dhandapani [CC0] (no alterations) via Pixabay https://pixabay.com/illustrations/mushroom-cartoon-fungus-vegetable-2844146/
"Rock Stone Moos" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/rock-stone-moos-moss-158022/

outer core
"Earth Globe Planet" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/earth-globe-planet-world-147591/
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (temperature changed) via Pixabay https://pixabay.com/vectors/hot-temperature-thermometer-weather-159386/
"Lava Background Magma" by EriktheGreat [CC0] (cropped and brightened) via Pixabay https://pixabay.com/illustrations/lava-background-magma-nature-hot-499891/
"Sparks Molten Metal" by wetaft [CC0] (cropped) via Pixabay https://pixabay.com/photos/sparks-molten-metal-hot-iron-687092/

physical property
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/en/hot-temperature-thermometer-weather-159386/
"Slippery Wet Floor Danger" by OpenIcons [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/slippery-wet-floor-danger-warning-98821/
"Experiment Chemistry Liquid" by PublicDomainPictures [CC0] (cropped) via Pixabay https://pixabay.com/photos/experiment-chemistry-liquid-220023/

planet
"Planet Sun" by ipicgr [CC0] (no alterations) via Pixabay https://pixabay.com/illustrations/planet-sun-star-1497205/
"Earth Globe Planet" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/earth-globe-planet-world-147591/
"Galilean Monde" by WikiImages [CC0] (cropped) via Pixabay https://pixabay.com/photos/jupiter-planet-galilean-monde-io-11615/
"Saturn Planet Rings" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/saturn-planet-saturn-rings-148300/
"Jupiter Planet Space" by TheDigitalArtist [CC0] (no alterations) via Pixabay https://pixabay.com/illustrations/jupiter-planet-space-astronomy-942558/

Plantae
"Turtle Tortoise Sea" by kormandallas [CC0] (cropped) via Pixabay https://pixabay.com/photos/turtle-tortoise-sea-immersion-deep-2250720/
"Fungus Forest Mushroom" by HeyouRelax [CC0] (cropped) via Pixabay https://pixabay.com/photos/fungus-forest-mushroom-wild-2158028/
"leafy, background" by Leon Brooks [Public Domain] (cropped) via Pixnio https://pixnio.com/nature-landscapes/leaf-leaves/leafy-background
"Euglena Microorganisms Nutrition" by ep793 [CC0] (cropped) via Pixabay https://pixabay.com/illustrations/euglena-microorganisms-nutrition-2320760/
"Halobacteria" by NASA [Public Domain] (cropped) via Wikimedia Commons https://ca.m.wikipedia.org/wiki/Fitxer:Halobacteria.jpg
"Under a very high magnification of 20000X, this colorized scanning electron micrograph (SEM) revealed the presence of a single Gram-negative" by CDC/ Bette Jensen [Public Domain] (cropped) via Public Domain Files http://www.publicdomainfiles.com/show_file.php?id=13489041618725
"Eze jardin exotique" by Berthold Werner [Public Domain] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Eze_jardin_exotique.JPG
"Change Lake Grass" by telix2000 [CC0] (cropped) via Pixabay https://pixabay.com/photos/change-lake-grass-river-green-1931997/
"Tree Dawn Nature" by danfador [CC0] (cropped) via Pixabay https://pixabay.com/photos/tree-dawn-nature-bucovina-romania-338211/

population
"Rabbit Silhouette Black Isolated" by Gorkhs [CC0] (recolored) via Pixabay https://pixabay.com/en/rabbit-silhouette-black-2262101/
"Deer Male Animal" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/deer-male-animal-mammal-antlers-48417/

position
"Map Pin Illustrator" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/map-pin-illustrator-holder-place-42871/
"CCD5-8.5x11" by City of San Antonio [Public Domain] (cropped) via SanAntonio.gov https://www.sanantonio.gov/Portals/0/Files/GIS/PoliticalMaps/CCD5-8.5x11.pdf

potential energy
"Pilates Pilate Ball" by CoxinhaFotos [CC0] (cropped, recolored, and brightness adjusted) via Pixabay https://pixabay.com/vectors/pilates-pilate-ball-sphere-2137509/
"Grass Meadow Green" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/grass-meadow-green-agriculture-159804/
"Hand Fingers Grip" by OpenClipart-Vectors [CC0] (cropped and recolored) via Pixabay https://pixabay.com/vectors/hand-fingers-grip-grasp-seize-149680/
"Metal spring vector drawing" by Openclipart [CC0] (spring compressed) via PublicDomainVectors https://publicdomainvectors.org/en/free-clipart/Metal-spring-vector-drawing/26682.html

precipitate
"Beaker Chemistry Full" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/beaker-chemistry-full-glasswares-159176/

pressure
"Clamp Vice Grip" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/clamp-vice-grip-clasp-hold-tool-311532/

prokaryote
"DNA mutation" by Mouagip [Public Domain] (recolored, cropped and labels removed) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:DNA_UV_mutation.svg
"Turtle Tortoise Sea" by kormandallas [CC0] (cropped) via Pixabay https://pixabay.com/photos/turtle-tortoise-sea-immersion-deep-2250720/
"Fungus Forest Mushroom" by HeyouRelax [CC0] (cropped) via Pixabay https://pixabay.com/photos/fungus-forest-mushroom-wild-2158028/
"leafy, background" by Leon Brooks [Public Domain] (cropped) via Pixnio https://pixnio.com/nature-landscapes/leaf-leaves/leafy-background
"Euglena Microorganisms Nutrition" by ep793 [CC0] (cropped) via Pixabay https://pixabay.com/illustrations/euglena-microorganisms-nutrition-2320760/
"Halobacteria" by NASA [Public Domain] (cropped) via Wikimedia Commons https://ca.m.wikipedia.org/wiki/Fitxer:Halobacteria.jpg
"Under a very high magnification of 20000X, this colorized scanning electron micrograph (SEM) revealed the presence of a single Gram-negative" by CDC/ Bette Jensen [Public Domain] (cropped) via Public Domain Files http://www.publicdomainfiles.com/show_file.php?id=13489041618725

protist/Protista
"Turtle Tortoise Sea" by kormandallas [CC0] (cropped) via Pixabay https://pixabay.com/photos/turtle-tortoise-sea-immersion-deep-2250720/
"Fungus Forest Mushroom" by HeyouRelax [CC0] (cropped) via Pixabay https://pixabay.com/photos/fungus-forest-mushroom-wild-2158028/
"leafy, background" by Leon Brooks [Public Domain] (cropped) via Pixnio https://pixnio.com/nature-landscapes/leaf-leaves/leafy-background
"Euglena Microorganisms Nutrition" by ep793 [CC0] (cropped) via Pixabay https://pixabay.com/illustrations/euglena-microorganisms-nutrition-2320760/
"Halobacteria" by NASA [Public Domain] (cropped) via Wikimedia Commons https://ca.m.wikipedia.org/wiki/Fitxer:Halobacteria.jpg
"Under a very high magnification of 20000X, this colorized scanning electron micrograph (SEM) revealed the presence of a single Gram-negative" by CDC/ Bette Jensen [Public Domain] (cropped) via Public Domain Files http://www.publicdomainfiles.com/show_file.php?id=13489041618725
"Soil Earth Excavation" by OpenClipart-Vectors [CC0] (recolored and cropped) via Pixabay https://pixabay.com/vectors/soil-earth-excavation-exposed-575643/
"Protozoan Microbes Biology" by dbutlerdidit [CC0] (no alterations) via Pixabay https://pixabay.com/illustrations/protozoans-microbes-biology-science-1450090/
"Chondrus crispus - Köhler–s Medizinal-Pflanzen-034" by Franz Eugen Köhler, Köhler's Medizinal-Pflanzen [Public Domain] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Chondrus_crispus_-_K%C3%B6hler%E2%80%93s_Medizinal-Pflanzen-034.jpg

pure substance
"Beaker Chemistry Full" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/beaker-chemistry-full-glasswares-159176/

radiation
This image was created solely by Stephen Fleenor, PhD (Seidlitz Education)

renewable resource
"Seedling Potted Plant Sapling" by OpenClipart-Vectors [CC0] (rotated and brightness adjusted) via Pixabay https://pixabay.com/vectors/seedling-potted-plant-sapling-plant-154735/
"Wind Energy Renewable" by OpenClipart-Vectors [CC0] (cropped and recolored) via Pixabay https://pixabay.com/vectors/wind-energy-renewable-energy-wind-2029621/
"Wind Turbine Energy" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/wind-turbine-wind-energy-electricity-297804/
"Solar Panel Photovoltaic" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/solar-panel-photovoltaic-solar-cells-303455/
"Tree Forest Trunk" by OpenClipart-Vectors [CC0] (cropped and rotated) via Pixabay https://pixabay.com/vectors/tree-forest-trunk-nature-leaves-576847/
"Shovel Trowel Digging" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/shovel-trowel-digging-equipment-575661/

resource
"Drops of water liquid" by unknown [CC0] (cropped) via Pixabay https://pixabay.com/en/drops-of-water-water-liquid-fresh-578897/
"Húsafell Stone" by Pudpon [CC0 1.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:H%C3%BAsafell_Stone.png
"Barrel Container Oil" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/barrel-container-oil-metal-drum-36724/
"Pond Water Outdoor" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/pond-water-outdoor-grass-outdoors-310149/
"Association Community Group" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/association-community-group-meeting-152746/

revolve/revolution
"Earth Globe Planet" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/earth-globe-planet-world-147591/
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/

rock cycle
"Rocks Stone Nature" by Msaeedsalem [CC0] (cropped) via Pixabay https://pixabay.com/photos/rocks-stone-nature-isolated-2491924/
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (temperature changed) via Pixabay https://pixabay.com/vectors/hot-temperature-thermometer-weather-159386/
"Silica Carbonate Rock - Metamorphic Rock San Benito County California 1622" by Dave Dyet [Public Domain] (background removed) via Wikimedia Commons https://en.m.wikipedia.org/wiki/File:Silica_Carbonate_Rock_-_Metamorphic_Rock_San_Benito_County_California_1622.jpg
"Fossiliferous limestone (Tertiary; Florida, USA) 1 by James St. John [CC BY 2.0] (cropped) via Flickr https://www.flickr.com/photos/jsjgeology/24911425174
"Lava Background Magma" by EriktheGreat [CC0] (cropped and brightened) via Pixabay https://pixabay.com/illustrations/lava-background-magma-nature-hot-499891/
"Wind Energy Renewable" by OpenClipart-Vectors [CC0] (cropped and recolored) via Pixabay https://pixabay.com/vectors/wind-energy-renewable-energy-wind-2029621/
"Cloud Overcast Weather" by OpenClipat-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/cloud-overcast-weather-159388/
"Rain Cloud Nature" by Clker-Free-Vector-Images [CC0] (cropped) via Pixabay https://pixabay.com/vectors/rain-cloud-nature-weather-sky-310148/

rotate/rotation
"Rotating earth (huge)" by The MP [CC BY 3.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Rotating_earth_(huge).gif
"Map Pin Illustrator" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/map-pin-illustrator-holder-place-42871/

seafloor spreading
"Lava Background Magma" by EriktheGreat [CC0] (cropped and brightened) via Pixabay https://pixabay.com/illustrations/lava-background-magma-nature-hot-499891/
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (temperature changed) via Pixabay https://pixabay.com/vectors/hot-temperature-thermometer-weather-159386/
"Pumice Stone Structure" by stux [CC0] (brightness and contrast adjusted) via Pixabay https://pixabay.com/photos/pumice-stone-pumice-structure-fund-186302/

sediment
"Mountain Hill Rock" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/mountain-hill-rock-peak-barren-575618/
"Wind Energy Renewable" by OpenClipart-Vectors [CC0] (cropped and recolored) via Pixabay https://pixabay.com/vectors/wind-energy-renewable-energy-wind-2029621/
"Cloud Overcast Weather" by OpenClipat-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/cloud-overcast-weather-159388/
"Rain Cloud Nature" by Clker-Free-Vector-Images [CC0] (cropped) via Pixabay https://pixabay.com/vectors/rain-cloud-nature-weather-sky-310148/
"Satellite Soyuz Spaceship Space" by Alexas_Fotos [CC0] (no alterations) via Pixabay https://pixabay.com/photos/satellite-soyuz-spaceship-2771043/
"Sediment in the Gulf of Mexico" by Norman Kuring [Public Domain] (no alterations) via Wikimedia Commons https://en.wikipedia.org/wiki/File:Sediment_in_the_Gulf_of_Mexico.jpg

sedimentary rock
"Mountain Hill Rock" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/mountain-hill-rock-peak-barren-575618/
"Fossiliferous limestone (Tertiary; Florida, USA) 1 by James St. John [CC BY 2.0] (cropped) via Flickr https://www.flickr.com/photos/jsjgeology/24911425174

sexual reproduction
"Turtle Tortoise Sea" by kormandallas [CC0] (cropped) via Pixabay https://pixabay.com/photos/turtle-tortoise-sea-immersion-deep-2250720/
"Fungus Forest Mushroom" by HeyouRelax [CC0] (cropped) via Pixabay https://pixabay.com/photos/fungus-forest-mushroom-wild-2158028/
"leafy, background" by Leon Brooks [Public Domain] (cropped) via Pixnio https://pixnio.com/nature-landscapes/leaf-leaves/leafy-background
"Euglena Microorganisms Nutrition" by ep793 [CC0] (cropped) via Pixabay https://pixabay.com/illustrations/euglena-microorganisms-nutrition-2320760/
"Halobacteria" by NASA [Public Domain] (cropped) via Wikimedia Commons https://ca.m.wikipedia.org/wiki/Fitxer:Halobacteria.jpg
"Under a very high magnification of 20000X, this colorized scanning electron micrograph (SEM) revealed the presence of a single Gram-negative" by CDC/ Bette Jensen [Public Domain] (cropped) via Public Domain Files http://www.publicdomainfiles.com/show_file.php?id=13489041618725
"Baby Babyhood Childhood" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/baby-babyhood-childhood-cradle-2023174/
"Reproduction Impregnation" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/reproduction-impregnation-150566/
"DNA mutation" by Mouagip [Public Domain] (recolored, cropped and labels removed) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:DNA_UV_mutation.svg

solar power
"Solar Panel Photovoltaic" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/solar-panel-photovoltaic-solar-cells-303455/
"Cloud Overcast Weather" by OpenClipat-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/cloud-overcast-weather-159388/

species
"Amurtiger Tiger Big Cat" by Pixel-mixer [CC0] (cropped) via Pixabay https://pixabay.com/photos/amurtiger-tiger-big-cat-siberian-1975790/
"Puppy Labradoodle Pal" by slipschutz [CC0] (cropped) via Pixabay https://pixabay.com/photos/puppy-labradoodle-pal-friend-dog-5010561/
"Dog, Black Standard Poodle" by Karen Arnold [CC0 Public Domain] (cropped) via PublicDomainPictures https://www.publicdomainpictures.net/en/view-image.php?image=242148&picture=dog-black-standard-poodle
"Labrador Dog Outdoor" by stanze [CC0] (cropped) via Pixabay https://pixabay.com/photos/labrador-dog-outdoor-view-portrait-2121759/
"Cat Kitten Sit" by DarkWorkX [CC0] (cropped) via Pixabay https://pixabay.com/photos/cat-kitten-sit-isolated-red-white-2669554/

speed
"Stopwatch Racing Timer" by OpenClipart-Vectors [CC0] (second hand removed) via Pixabay https://pixabay.com/vectors/stopwatch-racing-timer-timing-153398/
"Automobile Car Red" by OpenClipart-Vectors [CC0] (transparency filter applied) via Pixabay https://pixabay.com/vectors/automobile-car-red-french-old-1300467/

streak
"Hand Fingers Grip" by OpenClipart-Vectors [CC0] (cropped and recolored) via Pixabay https://pixabay.com/vectors/hand-fingers-grip-grasp-seize-149680/
"Talc block" by Sanao [Public Domain] (background removed) via Wikimedia Commons https://en.wikipedia.org/wiki/File:Talc_block.jpg
"Hematite streak plate" by KarlaPanchuk [CC BY-SA 4.0] (cropped and recolored) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Hematite_streak_plate.jpg

subscript
"Baking Soda Box White" by evitaochel [CC0] (cropped and brightened) via Pixabay https://pixabay.com/photos/baking-soda-box-white-powder-768950/
"Vinegar Cleaning Cleaner" by evitochel [CC0] (cropped) via Pixabay https://pixabay.com/photos/vinegar-cleaning-cleaner-clean-768948/

substance
"Beaker Chemistry Full" by OpenClipart-Vectors [CC0] (recolored and cropped) via Pixabay https://pixabay.com/vectors/beaker-chemistry-full-glasswares-159176/
Untitled by unknown [CC0] (cropped and recolored) via Pxhere https://pxhere.com/en/photo/666730
"Explosions Pictogram Caution" by Clker-Free-Vector-Images [CC0] (cropped) via Pixabay https://pixabay.com/vectors/explosions-pictogram-caution-danger-28712/
"Fire Flame Flammable" by OpenIcons [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/flame-fire-flammable-inflammable-98645/

tectonic plates
"World Map" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/world-map-world-map-earth-global-297315/

temperature
"Beauty Face Girl" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/beauty-face-girl-head-portrait-1299249/
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (temperature changed) via Pixabay https://pixabay.com/vectors/hot-temperature-thermometer-weather-159386/
"Melt Ice Cube" by Clker-Free-Vector-Images [CC0] (recolored and cropped) via Pixabay https://pixabay.com/vectors/melt-ice-cube-ice-melting-blue-25202/

thermal energy
"Fire Flames Hell" by Clker-Free-Vector-Images [CC0] (stretched and rotated) via Pixabay https://pixabay.com/vectors/fire-flames-hell-burn-bright-307336/
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (temperature changed) via Pixabay https://pixabay.com/vectors/hot-temperature-thermometer-weather-159386/

transfer
"Battery Energy Power" by OpenClipart-Vectors [CC0] (rotated) via Pixabay https://pixabay.com/vectors/battery-energy-power-cell-156718/
"Melt Ice Cube" by Clker-Free-Vector-Images [CC0] (recolored) via Pixabay https://pixabay.com/vectors/melt-ice-cube-ice-melting-blue-25202/
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (temperature changed) via Pixabay https://pixabay.com/vectors/hot-temperature-thermometer-weather-159386/
"Light Torch Lamp" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/light-torch-lamp-electric-159858/
"Rabbit Silhouette Black Isolated" by Gorkhs [CC0] (no alterations) via Pixabay https://pixabay.com/en/rabbit-silhouette-black-2262101/

transform boundary
"Lava Background Magma" by EriktheGreat [CC0] (cropped and brightened) via Pixabay https://pixabay.com/illustrations/lava-background-magma-nature-hot-499891/
"Transform fault-1" by Los688 [Public Domain] (cropped and recolored) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Transform_fault-1.svg

unbalanced force
"Crate Box Wooden" by Clker-Free-Vector-Images [CC0] (elongated) via Pixabay https://pixabay.com/vectors/crate-box-wooden-container-package-310787/
"Push Pushing Move Moving" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/push-pushing-move-moving-action-150175/

unicellular
"Turtle Tortoise Sea" by kormandallas [CC0] (cropped) via Pixabay https://pixabay.com/photos/turtle-tortoise-sea-immersion-deep-2250720/
"Fungus Forest Mushroom" by HeyouRelax [CC0] (cropped) via Pixabay https://pixabay.com/photos/fungus-forest-mushroom-wild-2158028/
"leafy, background" by Leon Brooks [Public Domain] (cropped) via Pixnio https://pixnio.com/nature-landscapes/leaf-leaves/leafy-background
"Euglena Microorganisms Nutrition" by ep793 [CC0] (cropped) via Pixabay https://pixabay.com/illustrations/euglena-microorganisms-nutrition-2320760/
"Halobacteria" by NASA [Public Domain] (cropped) via Wikimedia Commons https://ca.m.wikipedia.org/wiki/Fitxer:Halobacteria.jpg
"Under a very high magnification of 20000X, this colorized scanning electron micrograph (SEM) revealed the presence of a single Gram-negative" by CDC/ Bette Jensen [Public Domain] (cropped) via Public Domain Files http://www.publicdomainfiles.com/show_file.php?id=13489041618725
"Koli Bacteria Escherichia Coli" by geralt [CC0] (no alterations) via Pixabay https://pixabay.com/photos/koli-bacteria-escherichia-coli-123081/

volcano
"Lava Background Magma" by EriktheGreat [CC0] (cropped and brightened) via Pixabay https://pixabay.com/illustrations/lava-background-magma-nature-hot-499891/
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (temperature changed) via Pixabay https://pixabay.com/vectors/hot-temperature-thermometer-weather-159386/

volume
"Measuring Glass Graduated Cylinder" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/measuring-glass-graduated-cylinder-152967/
"Bolt Nut" by OpenClipart-Vectors [CC0] (rotated) via Pixabay https://pixabay.com/vectors/bolt-nut-screw-152911/

7th Grade Science

abiotic
"Sunlight" by consuelo suarez [CC0] (cropped) via PublicDomainPictures https://www.publicdomainpictures.net/en/view-image.php?image=22515&picture=sunlight
"Drops of water liquid" by unknown [CC0] (cropped) via Pixabay https://pixabay.com/en/drops-of-water-water-liquid-fresh-578897/
"Soil" by Mesaytsegaye [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Soil.jpg
"Húsafell Stone" by Pudpon [CC0 1.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:H%C3%BAsafell_Stone.png

adapt/adaptation
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/
"Mouse Rodent Rat" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/mouse-rodent-rat-black-cute-296396/
"Gerbil Mouse Rodent" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/gerbil-mouse-rodent-brown-animal-303178/

allele
"Reproduction Impregnation" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/reproduction-impregnation-150566/
"DNA mutation" by Mouagip [Public Domain] (recolored, cropped and labels removed) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:DNA_UV_mutation.svg

ancestor
"Tapir Animal Baird’S Tapirus" by OpenClipart-Vectors [CC0] (rotated and recolored) via Pixabay https://pixabay.com/vectors/tapir-animal-baird-s-tapir-153797/
"Horseevolution" by Mcy jerry at English Wikipedia [CC BY-SA 3.0] (cropped, rotated and recolored) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Horseevolution.png
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/

aquifer
"Power Station Current The Industry" by JerryGorecki [CC0] (recolored) via Pixabay https://pixabay.com/vectors/power-station-current-the-industry-3664263/
"Brooklyn New York Skyline" by GDJ [CC0] (cropped) via Pixabay https://pixabay.com/vectors/brooklyn-new-york-skyline-cityscape-2858985/
"Cloud Overcast Weather" by OpenClipat-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/cloud-overcast-weather-159388/
"Rain Cloud Nature" by Clker-Free-Vector-Images [CC0] (cropped) via Pixabay https://pixabay.com/vectors/rain-cloud-nature-weather-sky-310148/
"Waste Scrap Metal Rust" by Juhele [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/waste-scrap-metal-rust-mould-can-4326821/

asexual reproduction
This image was created solely by Stephen Fleenor, PhD (Seidlitz Education)

atmosphere
"Earth Globe Planet" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/earth-globe-planet-world-147591/
"Zelkova Serrata Tree Bonsai" by Deedster [CC0] (cropped and rotated) via Pixabay https://pixabay.com/en/zelkova-serrata-tree-bonsai-zelkova-1613784/

autotroph
"CSIRO ScienceImage 4203 A bluegreen algae species Cylindrospermum sp under magnification" by Willem van Aken, CSIRO [CC BY 3.0] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:CSIRO_ScienceImage_4203_A_bluegreen_algae_species_Cylindrospermum_sp_under_magnification.jpg
"Rabbit Silhouette Black Isolated" by Gorkhs [CC0] (rotated) via Pixabay https://pixabay.com/en/rabbit-silhouette-black-2262101/
"leafy, background" by Leon Brooks [Public Domain] (cropped) via Pixnio https://pixnio.com/nature-landscapes/leaf-leaves/leafy-background

behavior
"Bat Flying Wings" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/bat-flying-wings-halloween-fear-47821/
"Barbary Ape Eat Apple Endangered" by Alexas_Fotos [CC0] (no alterations) via Pixabay https://pixabay.com/photos/barbary-ape-eat-apple-3538256/
"Fox Sleeping Resting" by Pexels [CC0] (no alterations) via Pixabay https://pixabay.com/photos/fox-sleeping-resting-relaxing-red-1284512/
"Bird Singer Singing" by TeeFarm [CC0] (tone adjusted) via Pixabay https://pixabay.com/photos/bird-singer-singing-chirp-tweet-2119874/
"Cat Bristling Fight" by ivabalk [CC0] (cropped) via Pixabay https://pixabay.com/photos/cat-bristling-fight-preparation-4164689/
"Beaker Chemistry Full" by OpenClipart-Vectors [CC0] (recolored) via Pixabay https://pixabay.com/vectors/beaker-chemistry-full-glasswares-159176/

biodiversity
"Caterpillar Monarch Butterfly" by OpenClipart-Vectors [CC0] (rotated) via Pixabay https://pixabay.com/en/caterpillar-monarch-butterfly-156937/
"tail seabird nature wildlife" by unknown [CC0] (no alterations) via SVG Silh https://svgsilh.com/image/24432.html
"Bird Silhouette Flying" by Elionas [CC0] (no alterations) via Pixabay https://pixabay.com/en/bird-silhouette-flying-movement-1314469/
"Beaver Animal Rodent" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/beaver-animal-rodent-standing-tail-48437/
"Moose Large Body" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/moose-large-body-animal-mammal-48465/
"Dandelion Flower Yellow" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/dandelion-flower-yellow-plant-weed-31406/
"Beedle Insect Bug" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/beetle-insect-bug-blue-black-legs-34372/
"Cougar Mountain Lion" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/cougar-mountain-lion-wild-animal-47667/
"Forest Trees Oak" by Clker-Free-Vector-Images [CC0] (recolored and cropped) via Pixabay https://pixabay.com/vectors/forest-trees-oak-fir-pine-spruce-31910/
"Rabbit Silhouette Black Isolated" by Gorkhs [CC0] (no alterations) via Pixabay https://pixabay.com/en/rabbit-silhouette-black-2262101/

biological weathering
"Soil" by Mesaytsegaye [Public Domain] (rotated) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Soil.jpg
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/
"Húsafell Stone" by Pudpon [CC0 1.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:H%C3%BAsafell_Stone.png
"Zelkova Serrata Tree Bonsai" by Deedster [CC0] (cropped and rotated) via Pixabay https://pixabay.com/en/zelkova-serrata-tree-bonsai-zelkova-1613784/
Untitled by unknown [CC0] (cropped) via Pxhere https://pxhere.com/en/photo/1369678
"Dicotyledoneae Asteraceae herb - root system, primary root becomes tap root and lateral roots" by RoRo [CC0 1.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Dicotyledoneae_Asteraceae_herb_-_root_system,_primary_root_becomes_tap_root_and_lateral_roots.JPG
"Warning Corrosive Yellow Attention Acid Sign" by unknown [CC0] (no alterations) via Max Pixel https://www.maxpixel.net/Warning-Corrosive-Yellow-Attention-Acid-Sign-98647

biome
"Biomes of the world" by Terpsichores [CC BY-SA 3.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Biomes_of_the_world.svg
"Bamboo Jungle Tropical Bamboo Forest" by unknown [CC0] (cropped) via Max Pixel https://www.maxpixel.net/Bamboo-Jungle-Tropical-Bamboo-Forest-1167317
"Sun Desert Arid Joshua Tree California Dry" by unknown [CC0] (cropped) via Max Pixel https://www.maxpixel.net/Sun-Desert-Arid-Joshua-Tree-California-Dry-3008332
"Rocky Mountain National Park –Tundra" by Roger W [CC BY-SA 2.0] (cropped) via Flickr https://www.flickr.com/photos/24736216@N07/4016097359

biotic
"Development Germinating" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/en/development-germinating-germination-1300176/
"Elephant Animal Trunk" by Clker-Free-Vector-Images [CC0] (cropped) via Pixabay https://pixabay.com/en/elephant-animal-trunk-tusks-large-48423/
"Bones Bleached White" by holmespj [CC0] (cropped) via Pixabay https://pixabay.com/photos/bones-bleached-white-death-drought-3670740/
"Ink Red Splatter" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/ink-red-splatter-abstract-paint-303244/

blood vessel
"Circulatory System no tags" by LadyofHats [Public Domain] (cropped) via Wikimedia Commons https://zh-yue.wikipedia.org/wiki/File:Circulatory_System_no_tags.svg
"Anatomy Blood Vessel" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/en/anatomy-blood-vessel-red-156854/

carbon dioxide
"Rabbit Silhouette Black Isolated" by Gorkhs [CC0] (no alterations) via Pixabay https://pixabay.com/en/rabbit-silhouette-black-2262101/
"Zelkova Serrata Tree Bonsai" by Deedster [CC0] (cropped and rotated) via Pixabay https://pixabay.com/en/zelkova-serrata-tree-bonsai-zelkova-1613784/
"Air Pollution Factory Industry" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/air-pollution-factory-industry-149241/

catastrophic event
"Bird Silhouette Flying" by Elionas [CC0] (no alterations) via Pixabay https://pixabay.com/en/bird-silhouette-flying-movement-1314469/
"Moose Large Body" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/moose-large-body-animal-mammal-48465/
"Rabbit Silhouette Black Isolated" by Gorkhs [CC0] (no alterations) via Pixabay https://pixabay.com/en/rabbit-silhouette-black-2262101/
"Stump Tree Log" by OpenClipart-Vectors [CC0] (recolored) via Pixabay https://pixabay.com/vectors/stump-tree-log-trunk-cut-nature-576907/
"Bare Leafless Plant" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/bare-leafless-plant-tree-winter-1297449/
"Storm Stormy Tornado" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/storm-stormy-tornado-weather-159391/
"Tree Log Fallen" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/tree-log-fallen-cartoon-nature-576846/
"Green Plants Leafy" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/green-plants-leafy-greenery-576288/
"Dirt Soil Nature" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/dirt-soil-nature-gardening-earth-576619/
"Green Plants Flowers" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/green-plants-flowers-greenery-576278/
"Tree Forest Trunk" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/tree-forest-trunk-nature-leaves-576848/
"Tree Forest Trunk" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/tree-forest-trunk-nature-leaves-576850/
"Plants Green Leaves" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/plants-green-leaves-leafy-greenery-576277/

cell
"Waterweed Plant Cell" by Vierschilling [CC0] (cropped) via Pixabay https://pixabay.com/photos/waterweed-plant-cell-mikroskopieren-1582259/

cell membrane
"0302 Phospholipid Bilayer labeled" by OpenStax [CC BY 3.0] (labels removed and cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:0302_Phospholipid_Bilayer_labeled.jpg
"0303 Lipid Bilayer With Various Components labeled" by OpenStax [CC BY 3.0] (protein channels isolated) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:0303_Lipid_Bilayer_With_Various_Components_labeled.jpg

cell wall
"0303 Lipid Bilayer With Various Components labeled" by OpenStax [CC BY 3.0] (cropped and labels removed) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:0303_Lipid_Bilayer_With_Various_Components_labeled.jpg
"Mushroom Cartoon Fungus" by basker_Dhandapani [CC0] (no alterations) via Pixabay https://pixabay.com/illustrations/mushroom-cartoon-fungus-vegetable-2844146/
"Zelkova Serrata Tree Bonsai" by Deedster [CC0] (cropped and rotated) via Pixabay https://pixabay.com/en/zelkova-serrata-tree-bonsai-zelkova-1613784/
"Human body silhouette" by Mikael Häggström [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Human_body_silhouette.svg

characteristic
This image was created solely by Stephen Fleenor, PhD (Seidlitz Education)

chemical change
"Beaker Chemistry Full" by OpenClipart-Vectors [CC0] (recolored) via Pixabay https://pixabay.com/vectors/beaker-chemistry-full-glasswares-159176/

chemical digestion
"Digestive system without labels" by LadyOfHats [Public Domain] (recolored) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Digestive_system_without_labels.svg
Apple Slice Fruit by Clker-Free-Vector-Images [CC0] (rotated) via Pixabay https://pixabay.com/en/apple-slice-fruit-food-juicy-ripe-31768/
"Warning Corrosive Yellow Attention Acid Sign" by unknown [CC0] (no alterations) via Max Pixel https://www.maxpixel.net/Warning-Corrosive-Yellow-Attention-Acid-Sign-98647

chemical energy
"L-asparagine-3D-balls" by Jynto and Ben Mills [Public Domain] (transparency added) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:L-asparagine-3D-balls.png
"Battery Energy Power" by OpenClipart-Vectors [CC0] (rotated) via Pixabay https://pixabay.com/vectors/battery-energy-power-cell-156718/
"Carrot Orange" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/carrot-orange-carrot-vegetables-1299147/
"Human body silhouette" by Mikael Häggström [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Human_body_silhouette.svg

chemical weathering
"Rg1024 Set of water drops" by rg1024 [CC0 1.0] (cropped and recolored) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Rg1024_Set_of_water_drops.svg
"Mother Allen Hexagon Nut" by AlexanderStein [CC0] (cropped) via Pixabay https://pixabay.com/photos/mother-allen-hexagon-nut-rust-173739/
"Nut Screw Macro" by videofan2 [CC0] (cropped) via Pixabay https://pixabay.com/photos/nut-screw-macro-reflections-metal-2051596/
"Weathering Limestone State College PA" by Jtsuby [Public Domain] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Weathering_Limestone_State_College_PA.jpg
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/

chlorophyll
"Chloroplast Chlorophyll Unlabelled" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/chloroplast-chlorophyll-unlabelled-35023/
"Chlorophyll-c2-3D-balls" by Jynto [CC0 1.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Chlorophyll-c2-3D-balls.png

chloroplast
"Rg1024 Set of water drops" by rg1024 [CC0 1.0] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Rg1024_Set_of_water_drops.svg
"Chloroplast Chlorophyll Unlabelled" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/chloroplast-chlorophyll-unlabelled-35023/

chromosome
"DNA mutation" by Mouagip [Public Domain] (recolored, cropped and labels removed) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:DNA_UV_mutation.svg

circulatory system
"Truck Delivery Box Vehicle Car Transport Shipping" by Unknown [CC0] (cropped and recolored) via Max Pixel https://www.maxpixel.net/Truck-Delivery-Box-Vehicle-Car-Transport-Shipping-2181037
"Circulatory System no tags" by LadyofHats [Public Domain] (no alterations) via Wikimedia Commons https://zh-yue.wikipedia.org/wiki/File:Circulatory_System_no_tags.svg

classify/classification
This image was created solely by Stephen Fleenor, PhD (Seidlitz Education)

climate
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/hot-temperature-thermometer-weather-159386/
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/
"Wind Energy Renewable" by OpenClipart-Vectors [CC0] (cropped and recolored) via Pixabay https://pixabay.com/vectors/wind-energy-renewable-energy-wind-2029621/
"Weather Icons Cloud" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/weather-icons-cloud-meteorology-160759/
"Water Droplet" by madartzgraphics [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/water-water-droplet-droplet-2072211/

climax community
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/
"Grass Meadow Green" by OpenClipart-Vectors [CC0] (recolored) via Pixabay https://pixabay.com/vectors/grass-meadow-green-agriculture-159804/
"Lichen Stone Rock" by aitoff [CC0] (cropped) via Pixabay https://pixabay.com/photos/lichen-stone-rock-old-patina-620136/
"Húsafell Stone" by Pudpon [CC0 1.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:H%C3%BAsafell_Stone.png

composition
"Drinks Lemon Ade Cool" by eommina [CC0] (no alterations) via Pixabay https://pixabay.com/photos/drinks-lemon-ade-cool-lemonade-1825702/
"Water Glass Drip" by boristrost [CC0] (no alterations) via Pixabay https://pixabay.com/photos/water-glass-drip-drink-clear-1585192/
"Salt Cooking Rock Salt" by moritz320 [CC0] (cropped) via Pixabay https://pixabay.com/photos/salt-cooking-salt-rock-salt-4418749/
"Lemons Yellow Food" by Richardjohn [CC0] (no alterations) via Pixabay https://pixabay.com/photos/lemons-yellow-food-fruit-fresh-2039830/
"Bricks Concrete Rock" by Pexels [CC0] (no alterations) via Pixabay https://pixabay.com/photos/bricks-concrete-rock-stone-1839553/
"Brick Wall Brickwork White" MabelAmber [CC0] (no alterations) via Pixabay https://pixabay.com/photos/brick-wall-wall-brickwork-3079574/

compound
This image was created solely by Stephen Fleenor, PhD (Seidlitz Education)

consumer
"Marine food web" by Siyavula Education [CC BY 2.0] (no alterations) via Flickr https://www.flickr.com/photos/121935927@N06/13578843423

cytoplasm
"Animal mitochondrion diagram unlabeled" by LadyofHats [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Animal_mitochondrion_diagram_unlabelled.svg
"Rg1024 Set of water drops" by rg1024 [CC0 1.0] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Rg1024_Set_of_water_drops.svg

decomposer/detritivore
"bacterium h bacterium" by Unknown [CC0] (no alterations) via SVG Silh https://svgsilh.com/image/1455818.html
"bacteria illness bacterium infection" by Unknown [CC0] (no alterations) via SVG Silh https://svgsilh.com/image/156869.html
"Branch Leaf Tree" by Clker-Free-Vector-Images [CC0] (rotated) via Pixabay https://pixabay.com/vectors/branch-leaf-tree-dead-fall-plant-37778/
"Dead mouse" by Madprime [CC0 1.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Dead_mouse.svg
"Mushroom Cartoon Fungus" by basker_Dhandapani [CC0] (no alterations) via Pixabay https://pixabay.com/illustrations/mushroom-cartoon-fungus-vegetable-2844146/
"Tree Art Artwork" by OpenClipart-Vectorts [CC0] (rotated) via Pixabay https://pixabay.com/vectors/tree-art-artwork-trunk-cartoon-576866/
"Biodiversity Earthworm Fertilizer" by OpenClipart-Vectors [CC0] (rotated) via Pixabay https://pixabay.com/vectors/biodiversity-earthworm-fertilizer-160380/

deposition
"Beach Desert Dune Sand" by OpenClipart-Vectors [CC0] (dune erased) via Pixabay https://pixabay.com/vectors/beach-desert-dune-sand-157340/
"Wind Energy Renewable" by OpenClipart-Vectors [CC0] (cropped and recolored) via Pixabay https://pixabay.com/vectors/wind-energy-renewable-energy-wind-2029621/
"Húsafell Stone" by Pudpon [CC0 1.0] (cropped and recolored) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:H%C3%BAsafell_Stone.png

descend/descendant
"Homo habilis-2" by W. Schnaubelt & N. Kieser (Atelier WILD LIFE ART) [CC BY-SA 2.5] (no alterations) via Wikimedia Commons https://en.wikipedia.org/wiki/File:Homo_habilis-2.JPG
"Homo erectus new" by W. Schnaubelt & N. Kieser (Atelier WILD LIFE ART) [CC BY-SA 2.5] (no alterations) via Wikimedia Commons https://en.wikipedia.org/wiki/File:Homo_erectus_new.JPG
"Homo heidelbergensis - forensic facial reconstruction-crop" by Cicero Moraes [CC BY-SA 3.0] (no alterations) via Wikimedia Commons https://en.wikipedia.org/wiki/File:Homo_heidelbergensis_-_forensic_facial_reconstruction-crop.png
Untitled by U.S. Army [Public Domain] (cropped) via U.S. Army https://www.army.mil/article/45790/picatinny_engineer_earns_dod_recognition_for_service_to_nj_hispanic_community
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/

dichotomous key/identification key
"Insects Various Insect" by divotomezove [CC0] (cropped and rotated) via Pixabay https://pixabay.com/photos/insects-various-insect-bug-bugs-3700843/

digestive system
"Digestive system without labels" by LadyOfHats [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Digestive_system_without_labels.svg
"Apple Slice Fruit" by Clker-Free-Vector-Images [CC0] (rotated) via Pixabay https://pixabay.com/en/apple-slice-fruit-food-juicy-ripe-31768/

diversity/diverse
"Maize Field Corn" by GraphicsSC [CC0] (brightened) via Pixabay https://pixabay.com/photos/maize-field-corn-field-1001106/
"Corn Market Hazelnut" by GregReese [CC0] (no alterations) via Pixabay https://pixabay.com/photos/corn-market-hazelnut-agriculture-3229230/
"Caterpillar Monarch Butterfly" by OpenClipart-Vectors [CC0] (rotated) via Pixabay https://pixabay.com/en/caterpillar-monarch-butterfly-156937/
"tail seabird nature wildlife" by unknown [CC0] (no alterations) via SVG Silh https://svgsilh.com/image/24432.html
"Bird Silhouette Flying" by Elionas [CC0] (no alterations) via Pixabay https://pixabay.com/en/bird-silhouette-flying-movement-1314469/
"Beaver Animal Rodent" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/beaver-animal-rodent-standing-tail-48437/
"Moose Large Body" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/moose-large-body-animal-mammal-48465/
"Dandelion Flower Yellow" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/dandelion-flower-yellow-plant-weed-31406/
"Beedle Insect Bug" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/beetle-insect-bug-blue-black-legs-34372/
"Cougar Mountain Lion" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/cougar-mountain-lion-wild-animal-47667/
"Forest Trees Oak" by Clker-Free-Vector-Images [CC0] (recolored and cropped) via Pixabay https://pixabay.com/vectors/forest-trees-oak-fir-pine-spruce-31910/
"Rabbit Silhouette Black Isolated" by Gorkhs [CC0] (no alterations) via Pixabay https://pixabay.com/en/rabbit-silhouette-black-2262101/

DNA (deoxyribonucleic acid)
"Icons Information Rodentia" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/icons-information-rodentia-icons-1294597/
"Genetics Chromosome Rna" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/genetics-chromosomes-rna-dna-156404/

dominant
"Brown Eye Eyelash" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/brown-eye-eyelash-optic-optical-2027395/
"Blue Eye Eyelash" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/blue-eye-eyelash-optic-optical-2027392/

dormancy
"Onion Vintage Drawing" by ArtsyBee [CC0] (cropped) via Pixabay https://pixabay.com/illustrations/onion-vintage-drawing-old-2933406/
"Bear Lies Sleeps" by creozavr [CC0] (rotated) via Pixabay https://pixabay.com/illustrations/bear-lies-sleeps-sleep-resting-2079672/
"Animal Bear Brown" by OpenClipart-Vectors [CC0] (rotated) via Pixabay https://pixabay.com/vectors/animal-bear-brown-cub-cute-hairy-160462/
"Landscape Spring Summer" by OpenClipart-Vectors [CC0] (cropped and recolored) via Pixabay https://pixabay.com/vectors/landscape-spring-summer-fields-152502/
"Stem Leaves Paris Parts Plant" by Unknown [CC0] (no alterations) via Max Pixel https://www.maxpixel.net/Stem-Leaves-Paris-Plants-Leaf-2082612
"Dicotyledoneae Asteraceae herb - root system, primary root becomes tap root and lateral roots" by RoRo [CC0 1.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Dicotyledoneae_Asteraceae_herb_-_root_system,_primary_root_becomes_tap_root_and_lateral_roots.JPG
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/

drought
"Cloud Overcast Weather" by OpenClipat-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/cloud-overcast-weather-159388/
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/

earthquake
"Apartment Houses Brick" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/apartment-houses-brick-buildings-159414/

ecological succession
"Soil Earth Excavation" by OpenClipart-Vectors [CC0] (recolored and cropped) via Pixabay https://pixabay.com/vectors/soil-earth-excavation-exposed-575643/
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/
"Grass Meadow Green" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/grass-meadow-green-agriculture-159804/

ecosystem
"Rabbit Silhouette Black Isolated" by Gorkhs [CC0] (recolored) via Pixabay https://pixabay.com/en/rabbit-silhouette-black-2262101/
"Moose Large Body" by Clker-Free-Vector-Images [CC0] (recolored) via Pixabay https://pixabay.com/en/moose-large-body-animal-mammal-48465/
"Caterpillar Monarch Butterfly" by OpenClipart-Vectors [CC0] (recolored) via Pixabay https://pixabay.com/en/caterpillar-monarch-butterfly-156937/
"Pond Water Outdoor" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/pond-water-outdoor-grass-outdoors-310149/
"Cougar Mountain Lion" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/cougar-mountain-lion-wild-animal-47667/

endocrine system
"Human body silhouette" by Mikael Häggström [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Human_body_silhouette.svg
"Airmail Envelope Back View" by Karen Arnold [CC0] (rotated) via PublicDomainPictures https://www.publicdomainpictures.net/en/view-image.php?image=42544&picture=airmail-envelope-back-view

energy conversion/transformation
"Beaker Experiment Bubbles" by OpenClipart-Vectors [CC0] (recolored) via Pixabay https://pixabay.com/vectors/beaker-experiment-bubbles-chemistry-148167/
"Light Bulb Lightbulb" by Clker-Free-Vector-Images [CC0] (rotated) via Pixabay https://pixabay.com/vectors/light-bulb-lightbulb-light-bulb-34547/
"Battery Energy Power" by OpenClipart-Vectors [CC0] (rotated) via Pixabay https://pixabay.com/vectors/battery-energy-power-cell-156718/
"Carrot Orange" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/carrot-orange-carrot-vegetables-1299147/
"Silhouette Running Run" by mohammed_hassan [CC0] (rotated) via Pixabay https://pixabay.com/vectors/silhouette-running-run-fast-3199472/

energy pyramid
"bacterium h bacterium" by Unknown [CC0] (no alterations) via SVG Silh https://svgsilh.com/image/1455818.html
"bacteria illness bacterium infection" by Unknown [CC0] (no alterations) via SVG Silh https://svgsilh.com/image/156869.html
"Mushroom Cartoon Fungus" by basker_Dhandapani [CC0] (no alterations) via Pixabay https://pixabay.com/illustrations/mushroom-cartoon-fungus-vegetable-2844146/
"Biodiversity Earthworm Fertilizer" by OpenClipart-Vectors [CC0] (rotated) via Pixabay https://pixabay.com/vectors/biodiversity-earthworm-fertilizer-160380/
"Caterpillar Monarch Butterfly" by OpenClipart-Vectors [CC0] (rotated) via Pixabay https://pixabay.com/en/caterpillar-monarch-butterfly-156937/
"Cougar Mountain Lion" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/cougar-mountain-lion-wild-animal-47667/
"Bird" by yves_guillou (OCAL) [Public Domain] (no alterations) via Free Stock Photos http://www.freestockphotos.biz/stockphoto/15184
"Zelkova Serrata Tree Bonsai" by Deedster [CC0] (cropped and rotated) via Pixabay https://pixabay.com/en/zelkova-serrata-tree-bonsai-zelkova-1613784/
"Dandelion Flower Yellow" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/dandelion-flower-yellow-plant-weed-31406/
"Animal Bear Brown" by OpenClipart-Vectors [CC0] (rotated) via Pixabay https://pixabay.com/vectors/animal-bear-brown-cub-cute-hairy-160462/
"Rabbit Silhouette Black Isolated" by Gorkhs [CC0] (no alterations) via Pixabay https://pixabay.com/en/rabbit-silhouette-black-2262101/

environment
"Rabbit Silhouette Black Isolated" by Gorkhs [CC0] (recolored) via Pixabay https://pixabay.com/en/rabbit-silhouette-black-2262101/
"Moose Large Body" by Clker-Free-Vector-Images [CC0] (recolored) via Pixabay https://pixabay.com/en/moose-large-body-animal-mammal-48465/
"Caterpillar Monarch Butterfly" by OpenClipart-Vectors [CC0] (recolored) via Pixabay https://pixabay.com/en/caterpillar-monarch-butterfly-156937/
"Pond Water Outdoor" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/pond-water-outdoor-grass-outdoors-310149/
"Human body silhouette" by Mikael Häggström [Public Domain] (recolored) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Human_body_silhouette.svg
"Fish Tuna Blue" by Clker-Free-Vector-Images [CC0] (recolored) via Pixabay https://pixabay.com/vectors/fish-tuna-blue-sea-food-seafood-30828/

erosion
"Mountain Hill Rock" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/mountain-hill-rock-peak-barren-575618/
"Wind Energy Renewable" by OpenClipart-Vectors [CC0] (cropped and recolored) via Pixabay https://pixabay.com/vectors/wind-energy-renewable-energy-wind-2029621/
"Cloud Overcast Weather" by OpenClipat-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/cloud-overcast-weather-159388/
"Rain Cloud Nature" by Clker-Free-Vector-Images [CC0] (cropped) via Pixabay https://pixabay.com/vectors/rain-cloud-nature-weather-sky-310148/

evaporation
"Rg1024 Set of water drops" by rg1024 [CC0 1.0] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Rg1024_Set_of_water_drops.svg
"Beaker Chemistry Full" by OpenClipart-Vectors [CC0] (contrast adjusted, transparency filter added, and water level changed) via Pixabay https://pixabay.com/vectors/beaker-chemistry-full-glasswares-159176/

excretion
"Human body silhouette" by Mikael Häggström [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Human_body_silhouette.svg
"Trash Waste Recycling" by Painter06 [CC0] (no alterations) via Pixabay https://pixabay.com/en/trash-waste-recycling-recyclable-3323974/
"Urinary system" by Mikael Häggström [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Urinary_system.gif

excretory system
"Human body silhouette" by Mikael Häggström [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Human_body_silhouette.svg
"Trash Waste Recycling" by Painter06 [CC0] (rotated) via Pixabay https://pixabay.com/en/trash-waste-recycling-recyclable-3323974/
"Urinary system" by Mikael Häggström [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Urinary_system.gif

external
"Box Open Cardboard" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/box-open-cardboard-box-cardboard-152428/

feature
"Rhinocerous Beetle Nature" by RolandKuck [CC0] (no alterations) via Pixabay https://pixabay.com/en/rhinoceros-beetle-nature-free-1974362/
"Giraffe Nature Africa" by OpenClipart-Vectors [CC0] (neck and legs shortened) via Pixabay https://pixabay.com/vectors/giraffe-nature-africa-safari-152607/
"Beetle Rhino Insect" by Romario99 [CC0] (cropped and rotated) via Pixabay https://pixabay.com/photos/beetle-rhino-insect-nature-macro-4488578/

feedback loop/mechanism
This image was created solely by Stephen Fleenor, PhD (Seidlitz Education)

flood
"Rg1024 Set of water drops" by rg1024 [CC0 1.0] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Rg1024_Set_of_water_drops.svg
"Cloud Overcast Weather" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/cloud-overcast-weather-159388/
"Rain Cloud Nature" by Clker-Free-Vector-Images [CC0] (cropped) via Pixabay https://pixabay.com/vectors/rain-cloud-nature-weather-sky-310148/
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/

flow of energy
"Caterpillar Monarch Butterfly" by OpenClipart-Vectors [CC0] (rotated) via Pixabay https://pixabay.com/en/caterpillar-monarch-butterfly-156937/
"Cougar Mountain Lion" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/cougar-mountain-lion-wild-animal-47667/
"Bird" by yves_guillou (OCAL) [Public Domain] (no alterations) via Free Stock Photos http://www.freestockphotos.biz/stockphoto/15184

food chain
"Caterpillar Monarch Butterfly" by OpenClipart-Vectors [CC0] (rotated) via Pixabay https://pixabay.com/en/caterpillar-monarch-butterfly-156937/
"Cougar Mountain Lion" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/cougar-mountain-lion-wild-animal-47667/
"Bird" by yves_guillou (OCAL) [Public Domain] (no alterations) via Free Stock Photos http://www.freestockphotos.biz/stockphoto/15184

food web
"Marine food web" by Siyavula Education [CC BY 2.0] (no alterations) via Flickr https://www.flickr.com/photos/121935927@N06/13578843423

force
"Magnet Magnetic Poles Magnetism" by Clker-Free-Vector-Images [CC0] (rotated) via Pixabay https://pixabay.com/vectors/magnet-magnetic-poles-magnetism-297698/
"Tree Apple" by Kjristie [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/tree-apple-apple-tree-nature-fruit-923776/
"Apple Red Fruit" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/apple-red-fruit-vitamins-healthy-158419/
"Crate Box Wooden" by Clker-Free-Vector-Images [CC0] (elongated) via Pixabay https://pixabay.com/vectors/crate-box-wooden-container-package-310787/
"Push Pushing Move Moving" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/push-pushing-move-moving-action-150175/
"Silhouette Relationship Conflict" by mohamed_hassan [CC0] (cropped) via Pixabay https://pixabay.com/vectors/silhouette-relationship-conflict-3141264/

function
"Medical Sister Syringe White Male" by 3dman_eu [CC0] (no alterations) via Pixabay https://pixabay.com/illustrations/medical-sister-syringe-white-male-1780696/
"Craftsman Mechanic Helm" by 3dman_eu [CC0] (no alterations) via Pixabay https://pixabay.com/illustrations/craftsmen-mechanic-helm-workers-1020156/ \
"Chef Cook Spices" by 3dman_eu [CC0] (no alterations) via Pixabay https://pixabay.com/illustrations/chef-cook-spices-seasoning-1816252/
"Males Model 3D Isolated" by 3dman_eu [CC0] (no alterations) via Pixabay https://pixabay.com/illustrations/males-3d-model-isolated-3d-model-2065283/

gene
"DNA mutation" by Mouagip [Public Domain] (recolored, cropped and labels removed) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:DNA_UV_mutation.svg
"Icons Information Rodentia" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/icons-information-rodentia-icons-1294597/

generation
"People Man Women" by AnnaliseArt [CC0] (cropped) via Pixabay https://pixabay.com/illustrations/people-man-women-grandma-grandpa-4035403/

genetics/heredity
"DNA mutation" by Mouagip [Public Domain] (recolored, cropped and labels removed) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:DNA_UV_mutation.svg
"Mouse Brown Pink" by Clker-Free-Vector-Images [CC0] (rotated) via Pixabay https://pixabay.com/vectors/mouse-brown-pink-cute-ears-tail-304966/
"Mouse Rodent Black" by Clker-Free-Vector-Images [CC0] (rotated) via Pixabay https://pixabay.com/vectors/mouse-rodent-black-animal-cute-303746/
"Mouse Rodent Rat" by Clker-Free-Vector-Images [CC0] (rotated) via Pixabay https://pixabay.com/vectors/mouse-rodent-rat-black-cute-296396/

genotype
"Eye brown" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/eye-brown-eye-brown-face-girl-157815/

geotropism
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/
"Development Germinating" by OpenClipart-Vectors [CC0] (cropped and rotated) via Pixabay https://pixabay.com/en/development-germinating-germination-1300176/

glucose
"Human body silhouette" by Mikael Häggström [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Human_body_silhouette.svg
"Carrot Orange" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/carrot-orange-carrot-vegetables-1299147/

groundwater
"Rg1024 Set of water drops" by rg1024 [CC0 1.0] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Rg1024_Set_of_water_drops.svg
"Cloud Overcast Weather" by OpenClipat-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/cloud-overcast-weather-159388/
"Rain Cloud Nature" by Clker-Free-Vector-Images [CC0] (cropped) via Pixabay https://pixabay.com/vectors/rain-cloud-nature-weather-sky-310148/

habitat
"Forest Fern Nature" by Bieniu94 [CC0] (cropped) via Pixabay https://pixabay.com/en/forest-fern-nature-photo-picture-3492362/
"Polar Bear Snow Predator" by kalhh [CC0] (cropped) via Pixabay https://pixabay.com/en/polar-bear-snow-predator-cold-3629687/
"Desert tortoise (Gopherus agassizii)" by Robb Hannawacker [CC0] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Desert_tortoise_(Gopherus_agassizii).jpg
"House Home White" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/house-home-white-shapes-chimney-48764/

heterotroph
"Cougar Mountain Lion" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/cougar-mountain-lion-wild-animal-47667/
"Rabbit Silhouette Black Isolated" by Gorkhs [CC0] (no alterations) via Pixabay https://pixabay.com/en/rabbit-silhouette-black-2262101/
"Dandelion Flower Yellow" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/dandelion-flower-yellow-plant-weed-31406/
"Mushroom Cartoon Fungus" by basker_Dhandapani [CC0] (no alterations) via Pixabay https://pixabay.com/illustrations/mushroom-cartoon-fungus-vegetable-2844146/

heterozygous
"Reproduction Impregnation" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/reproduction-impregnation-150566/

hibernation
"Bear Lies Sleeps" by creozavr [CC0] (rotated) via Pixabay https://pixabay.com/illustrations/bear-lies-sleeps-sleep-resting-2079672/
"Animal Bear Brown" by OpenClipart-Vectors [CC0] (rotated) via Pixabay https://pixabay.com/vectors/animal-bear-brown-cub-cute-hairy-160462/
"Landscape Spring Summer" by OpenClipart-Vectors [CC0] (cropped and recolored) via Pixabay https://pixabay.com/vectors/landscape-spring-summer-fields-152502/
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/

homeostasis
This image was created solely by Stephen Fleenor, PhD (Seidlitz Education)

homozygous
"Reproduction Impregnation" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/reproduction-impregnation-150566/

hurricane
"Rain Cloud Nature" by Clker-Free-Vector-Images [CC0] (cropped) via Pixabay https://pixabay.com/vectors/rain-cloud-nature-weather-sky-310148/
"GOES-16 image of hurricanes Katia, Irma and Jose on September 8, 2017" by NOAA [Public Domain] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:GOES-16_image_of_hurricanes_Katia,_Irma_and_Jose_on_September_8,_2017.jpg
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (temperature changed) via Pixabay https://pixabay.com/vectors/hot-temperature-thermometer-weather-159386/

integumentary system
"Human body silhouette" by Mikael Häggström [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Human_body_silhouette.svg
"bacteria illness bacterium infection" by Unknown [CC0] (recolored) via SVG Silh https://svgsilh.com/image/156869.html
"bacteria illness bacterium infection" by Unknown [CC0] (recolored) via SVG Silh https://svgsilh.com/image/156867.html
"bacterium h bacterium" by Unknown [CC0] (recolored) via SVG Silh https://svgsilh.com/image/1455818.html

internal
"Box Open Cardboard" by OpenClipart-Vectors [CC0] (cropped and recolored) via Pixabay https://pixabay.com/vectors/box-open-cardboard-box-cardboard-152428/

landform
"Mt Fuji Volcano Foggy" by kimura2 [CC0] (cropped) via Pixabay https://pixabay.com/photos/mt-fuji-volcano-foggy-mountain-477832/
"Tuscany Panorama Landscape" by Schwoaze [CC0] (cropped) via Pixabay https://pixabay.com/photos/tuscany-panorama-landscape-forest-3364498/
"Namibia Desert Sand" by FuN_Lucky [CC0] (cropped) via Pixabay https://pixabay.com/photos/namibia-desert-sand-dune-dust-2049203/
"Landscape Mountains Valleys" by Free-Photos (cropped) via Pixabay https://pixabay.com/photos/landscape-mountains-valleys-hills-691374/
"Canyon, north eastern Kurdistan" by Jim Gordon [CC BY 2.0] via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Canyon,_north_eastern_Kurdistan.jpg
"Mouths of amazon geocover 1990" by NASA [Public Domain] (no alterations) via Wikipedia https://hif.m.wikipedia.org/wiki/file:Mouths_of_amazon_geocover_1990.png

landslide
"Stump Tree Log" by OpenClipart-Vectors [CC0] (recolored) via Pixabay https://pixabay.com/vectors/stump-tree-log-trunk-cut-nature-576907/
"Plants Green Leaves" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/plants-green-leaves-leafy-greenery-576277/
"Moose Large Body" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/moose-large-body-animal-mammal-48465/
"Dirt Soil Nature" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/dirt-soil-nature-gardening-earth-576619/
"Tree Forest Trunk" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/tree-forest-trunk-nature-leaves-576848/
"Tree Forest Trunk" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/tree-forest-trunk-nature-leaves-576850/
"Green Plants Leafy" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/green-plants-leafy-greenery-576288/

limiting factor
"Rabbit Silhouette Black Isolated" by Gorkhs [CC0] (recolored) via Pixabay https://pixabay.com/en/rabbit-silhouette-black-2262101/
"Background Border Grass" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/background-border-grass-green-herb-2029768/

matter
"Crate Box Wooden" by Clker-Free-Vector-Images [CC0] (rotated and transparency filter applied) via Pixabay https://pixabay.com/vectors/crate-box-wooden-container-package-310787/
"Beaker Chemistry Full" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/beaker-chemistry-full-glasswares-159176/
"Balance Scale Weight" by OpenClipart-Vectors [CC0] (recolored) via Pixabay https://pixabay.com/vectors/balance-scale-weight-kitchen-154266/
"Weights Kilogram Kilo" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/weights-kilogram-kilo-metal-mass-157664/
"Birthday Balloon Red" by Clker-Free-Vector-Images [CC0] (cropped and rotated) via Pixabay https://pixabay.com/vectors/birthday-balloon-red-one-single-296558/

mechanical digestion
"Digestive system without labels" by LadyOfHats [Public Domain] (recolored) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Digestive_system_without_labels.svg
"Red apple" by James Birkett [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Red_apple.svg

mechanical weathering
"Mountain Hill Rock" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/mountain-hill-rock-peak-barren-575618/
"Wind Energy Renewable" by OpenClipart-Vectors [CC0] (cropped and recolored) via Pixabay https://pixabay.com/vectors/wind-energy-renewable-energy-wind-2029621/
"Cloud Overcast Weather" by OpenClipat-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/cloud-overcast-weather-159388/
"Rain Cloud Nature" by Clker-Free-Vector-Images [CC0] (cropped) via Pixabay https://pixabay.com/vectors/rain-cloud-nature-weather-sky-310148/

metabolism/metabolic activity
"Red apple" by James Birkett [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Red_apple.svg

migration
"Simple world map" by Tom-b [CC0 1.0] (brightened) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Simple_world_map.svg
"Bird Silhouette Flying" by Elionas [CC0] (rotated and glow added) via Pixabay https://pixabay.com/en/bird-silhouette-flying-movement-1314469/
"Moose Large Body" by Clker-Free-Vector-Images [CC0] (rotated, recolored and glow added) via Pixabay https://pixabay.com/en/moose-large-body-animal-mammal-48465/
"Dandelion Flowers" by Karen Arnold [CC0 1.0] (no alterations) via PublicDomainPictures https://www.publicdomainpictures.net/en/view-image.php?image=111268&picture=dandelion-flowers

mitochondria/mitochondrion
"Animal mitochondrion diagram unlabeled" by LadyofHats [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Animal_mitochondrion_diagram_unlabelled.svg

molecule
"Animal mitochondrion diagram unlabeled" by LadyofHats [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Animal_mitochondrion_diagram_unlabelled.svg

motion/move/movement
"Boy Female Girl" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/boy-female-girl-human-jumping-2029800/
"Silhouette Black Jumping" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/silhouette-black-jumping-man-guy-32193/
"People Walking Silhouette" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/people-walking-silhouette-black-33483/
"Bouncing Jump Child" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/bouncing-jump-child-girl-159517/

muscular system
"2006 Heart Musculature" by OpenStax College [CC BY 3.0] (labels removed) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:2006_Heart_Musculature.jpg "1021 Smooth Muscle new" by OpenStax [CC BY 4.0] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:1021_Smooth_Muscle_new.jpg
"Muscular system" by Termininja [CC BY-SA 3.0] (no alternations) via Wikimedia Commons https://upload.wikimedia.org/wikipedia/commons/archive/1/13/20120816180041%21Muscular_system.svg
"Skeletal muscle" by Unknown [CC0 1.0] (cropped and rotated) via FreeSVG https://freesvg.org/skeletal-muscle
"Bone Leg Femur" by b0red [CC0 ] (cropped) via Pixabay https://pixabay.com/vectors/bone-leg-bone-femur-human-medical-2937723/

mutation
This image was created solely by Stephen Fleenor, PhD (Seidlitz Education)

natural selection
"Nature Tree Orange" by Gellinger [CC0] (trunk elongated and cropped) via Pixabay https://pixabay.com/photos/nature-tree-orange-orange-tree-2444640/
"Giraffe Nature Africa" by OpenClipart-Vectors [CC0] (neck and legs shortened) via Pixabay https://pixabay.com/vectors/giraffe-nature-africa-safari-152607/

nervous system
"Nervous system diagram unlabeled" by Medium69 and Jmarchn [CC BY-SA 4.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Nervous_system_diagram_unlabeled.svg

niche
"Bees Insects Blossom" by Buntysmum [CC0] (cropped) via Pixabay https://pixabay.com/photos/bees-insects-blossom-blackberry-4003580/
"Earthworms The Frog’s Perspective After the Rain" by unknown [CC0] (cropped) via Max Pixel https://www.maxpixels.net/Earthworms-After-The-Rain-The-Frogs-Perspective-2773457

nucleus (cellular)
"DNA mutation" by Mouagip [Public Domain] (recolored, cropped and labels removed) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:DNA_UV_mutation.svg
"Diagram human cell nucleus no text" by Mariana Ruiz Villareal LadyofHats and Peter Znamenskiy [Public Domain] (recolored and cropped) via Wikimedia Commons https://en.wikipedia.org/wiki/File:Diagram_human_cell_nucleus_no_text.png
"Icons Information Rodentia" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/icons-information-rodentia-icons-1294597/
"Onion cells" by kaibara87 [CC BY 2.0] (rotated) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Onion_Cells.jpg

offspring
"Mouse Brown Pink" by Clker-Free-Vector-Images [CC0] (rotated) via Pixabay https://pixabay.com/vectors/mouse-brown-pink-cute-ears-tail-304966/
"Mouse Rodent Black" by Clker-Free-Vector-Images [CC0] (rotated) via Pixabay https://pixabay.com/vectors/mouse-rodent-black-animal-cute-303746/
"Mouse Rodent Rat" by Clker-Free-Vector-Images [CC0] (rotated) via Pixabay https://pixabay.com/vectors/mouse-rodent-rat-black-cute-296396/
"Zelkova Serrata Tree Bonsai" by Deedster [CC0] (cropped, rotated and brightened) via Pixabay https://pixabay.com/en/zelkova-serrata-tree-bonsai-zelkova-1613784/
"Seedling Seed Growth" by REDQUASAR [CC0] (no alterations) via Pixabay https://pixabay.com/illustrations/seedling-seed-growth-plant-green-2163773/
"Park Acorns Oak" by pasja1000 [CC0] (croppped) via Pixabay https://pixabay.com/photos/park-acorns-oak-foliage-plant-3682796/

organ
"Digestive system without labels" by LadyOfHats [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Digestive_system_without_labels.svg
"Stomach Muscles Muscle Layers" by LillyCantabile [CC0] (no alterations) via Pixabay https://pixabay.com/illustrations/stomach-muscles-muscle-layers-3329346/
"The Larynx Pharynx Anatomy" by ikkilacerda [CC0] (cropped) via Pixabay https://pixabay.com/illustrations/the-larynx-the-pharynx-anatomy-2381980/
"Liver Organ Anatomy" by LillyCantabile [CC0] (no alterations) via Pixabay https://pixabay.com/illustrations/liver-organ-anatomy-brown-3332302/

organ system
"Digestive system without labels" by LadyOfHats [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Digestive_system_without_labels.svg
"Circulatory System no tags" by LadyofHats [Public Domain] (no alterations) via Wikimedia Commons https://zh-yue.wikipedia.org/wiki/File:Circulatory_System_no_tags.svg
"Reproductive System" by Siyavula Education [CC BY 2.0] (labels removed and cropped) via Flickr https://www.flickr.com/photos/121935927@N06/13578806453
"Anatomy Lungs Breathing" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/anatomy-lungs-breathing-human-145696/

organelle
"DNA mutation" by Mouagip [Public Domain] (recolored, cropped and labels removed) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:DNA_UV_mutation.svg
"Diagram human cell nucleus no text" by Mariana Ruiz Villareal LadyofHats and Peter Znamenskiy [Public Domain] (recolored) via Wikimedia Commons https://en.wikipedia.org/wiki/File:Diagram_human_cell_nucleus_no_text.png
"Animal mitochondrion diagram unlabeled" by LadyofHats [Public Domain] (glow added) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Animal_mitochondrion_diagram_unlabelled.svg
"Chloroplast Chlorophyll Unlabelled" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/chloroplast-chlorophyll-unlabelled-35023/

organism
"Brown Bear Standing" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/brown-bear-standing-animal-fur-48446/
"Protozoan Microbes Biology" by dbutlerdidit [CC0] (no alterations) via Pixabay https://pixabay.com/illustrations/protozoans-microbes-biology-science-1450090/
"Zelkova Serrata Tree Bonsai" by Deedster [CC0] (cropped and rotated) via Pixabay https://pixabay.com/en/zelkova-serrata-tree-bonsai-zelkova-1613784/
"Beedle Insect Bug" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/beetle-insect-bug-blue-black-legs-34372/
"Stem Leaves Paris Parts Plant" by Unknown [CC0] (no alterations) via Max Pixel https://www.maxpixel.net/Stem-Leaves-Paris-Plants-Leaf-2082612
"Mushroom Cartoon Fungus" by basker_Dhandapani [CC0] (no alterations) via Pixabay https://pixabay.com/illustrations/mushroom-cartoon-fungus-vegetable-2844146/
"Rock Stone Moos" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/rock-stone-moos-moss-158022/

oxygen
"Rabbit Silhouette Black Isolated" by Gorkhs [CC0] (no alterations) via Pixabay https://pixabay.com/en/rabbit-silhouette-black-2262101/
"Zelkova Serrata Tree Bonsai" by Deedster [CC0] (cropped, rotated and brightened) via Pixabay https://pixabay.com/en/zelkova-serrata-tree-bonsai-zelkova-1613784/

percolate
"Background Border Grass" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/background-border-grass-green-herb-2029768/
"Rg1024 Set of water drops" by rg1024 [CC0 1.0] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Rg1024_Set_of_water_drops.svg
"Cloud Overcast Weather" by OpenClipat-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/cloud-overcast-weather-159388/
"Rain Cloud Nature" by Clker-Free-Vector-Images [CC0] (cropped) via Pixabay https://pixabay.com/vectors/rain-cloud-nature-weather-sky-310148/

phenotype
"Eye brown" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/eye-brown-eye-brown-face-girl-157815/
"Maple Leaf Green" by Sweetaholic [CC0] (no alterations) via Pixabay https://pixabay.com/photos/maple-leaf-green-maple-leaf-tree-888807/

phloem
"Stem Leaves Paris Parts Plant" by Unknown [CC0] (no alterations) via Max Pixel https://www.maxpixel.net/Stem-Leaves-Paris-Plants-Leaf-2082612
"Dicotyledoneae Asteraceae herb - root system, primary root becomes tap root and lateral roots" by RoRo [CC0 1.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Dicotyledoneae_Asteraceae_herb_-_root_system,_primary_root_becomes_tap_root_and_lateral_roots.JPG
"Rg1024 Set of water drops" by rg1024 [CC0 1.0] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Rg1024_Set_of_water_drops.svg

photosynthesis
"Zelkova Serrata Tree Bonsai" by Deedster [CC0] (cropped, rotated and brightened) via Pixabay https://pixabay.com/en/zelkova-serrata-tree-bonsai-zelkova-1613784/
"Rg1024 Set of water drops" by rg1024 [CC0 1.0] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Rg1024_Set_of_water_drops.svg

phototropism
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/
"Plant" by gsagri04 [Public Domain] (cropped and rotated) via Free Stock Photos http://www.freestockphotos.biz/stockphoto/15474

physical change
"Melt Ice Cube" by Clker-Free-Vector-Images [CC0] (recolored) via Pixabay https://pixabay.com/vectors/melt-ice-cube-ice-melting-blue-25202/

pioneer species
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/
"Figure 45 06 16" by CNX OpenStax [CC BY 4.0] (cropped and panel added) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Figure_45_06_16.jpg

pollution
"Power Station Current The Industry" by JerryGorecki [CC0] (recolored) via Pixabay https://pixabay.com/vectors/power-station-current-the-industry-3664263/
"Brooklyn New York Skyline" by GDJ [CC0] (cropped) via Pixabay https://pixabay.com/vectors/brooklyn-new-york-skyline-cityscape-2858985/
"Waste Scrap Metal Rust" by Juhele [CC0] (brightness adjusted) via Pixabay https://pixabay.com/vectors/waste-scrap-metal-rust-mould-can-4326821/
"Blue Car Road" by Clker-Free-Vector-Images [CC0] (recolored) via Pixabay https://pixabay.com/vectors/blue-car-road-transportation-drive-24358/
"Car Vehicle Transport" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/car-vehicle-transport-automotive-24315/
"Cross Skull Danger" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/cross-skull-danger-crossbones-296395/

precipitation
"Weather Icons Cloud" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/weather-icons-cloud-meteorology-160759/
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (temperature changed) via Pixabay https://pixabay.com/vectors/hot-temperature-thermometer-weather-159386/

primary succession
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/
"Grass Meadow Green" by OpenClipart-Vectors [CC0] (recolored) via Pixabay https://pixabay.com/vectors/grass-meadow-green-agriculture-159804/
"Lichen Stone Rock" by aitoff [CC0] (cropped) via Pixabay https://pixabay.com/photos/lichen-stone-rock-old-patina-620136/
"Húsafell Stone" by Pudpon [CC0 1.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:H%C3%BAsafell_Stone.png

producer
"Marine food web" by Siyavula Education [CC BY 2.0] (no alterations) via Flickr https://www.flickr.com/photos/121935927@N06/13578843423
"Checkmark green" by Nobbler 76 [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Checkmark_green.svg

proximity
This image was created solely by Stephen Fleenor, PhD (Seidlitz Education)

purebred
"Rose Blossom Full" by Clker-Free-Vector-Images [CC0] (recolored) via Pixabay https://pixabay.com/vectors/rose-blossom-full-bloom-flower-305214/

radiant/solar energy
"Zelkova Serrata Tree Bonsai" by Deedster [CC0] (cropped and rotated) via Pixabay https://pixabay.com/en/zelkova-serrata-tree-bonsai-zelkova-1613784/
"Pond Water Outdoor" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/pond-water-outdoor-grass-outdoors-310149/
"Illustration depicting the overturning circulation of the global ocean." by NASA/JPL [Public Domain] (no alterations) via NASA Jet Propulsion Laboratory https://www.jpl.nasa.gov/news/news.php?release=2010-101
"Wind Energy Renewable" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/wind-energy-renewable-energy-wind-2029621/
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/hot-temperature-thermometer-weather-159386/

recessive
"Brown Eye Eyelash" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/brown-eye-eyelash-optic-optical-2027395/
"Blue Eye Eyelash" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/blue-eye-eyelash-optic-optical-2027392/

reproductive system
"Reproduction Impregnation" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/reproduction-impregnation-150566/
"Reproductive System" by Siyavula Education [CC BY 2.0] (labels removed) via Flickr https://www.flickr.com/photos/121935927@N06/13578806453

respiratory system
"Human body silhouette" by Mikael Häggström [Public Domain] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Human_body_silhouette.svg
"Anatomy Lungs Breathing" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/anatomy-lungs-breathing-human-145696/

response
"Plant" by gsagri04 [Public Domain] (cropped and rotated) via Free Stock Photos http://www.freestockphotos.biz/stockphoto/15474
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/en/hot-temperature-thermometer-weather-159386/
"Beauty Face Girl" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/beauty-face-girl-head-portrait-1299249/
"Lamp Light Table" by simisi1 [CC0] (no alterations) via Pixabay https://pixabay.com/en/lamp-light-table-vector-2561267/

secondary succession
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/
"Grass Meadow Green" by OpenClipart-Vectors [CC0] (recolored) via Pixabay https://pixabay.com/vectors/grass-meadow-green-agriculture-159804/
"Fire Flames Hell" by Clker-Free-Vector-Images [CC0] (stretched and rotated) via Pixabay https://pixabay.com/vectors/fire-flames-hell-burn-bright-307336/

sediment
"Mountain Hill Rock" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/mountain-hill-rock-peak-barren-575618/
"Wind Energy Renewable" by OpenClipart-Vectors [CC0] (cropped and recolored) via Pixabay https://pixabay.com/vectors/wind-energy-renewable-energy-wind-2029621/
"Cloud Overcast Weather" by OpenClipat-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/cloud-overcast-weather-159388/
"Rain Cloud Nature" by Clker-Free-Vector-Images [CC0] (cropped) via Pixabay https://pixabay.com/vectors/rain-cloud-nature-weather-sky-310148/
"Satellite Soyuz Spaceship Space" by Alexas_Fotos [CC0] (no alterations) via Pixabay https://pixabay.com/photos/satellite-soyuz-spaceship-2771043/
"Sediment in the Gulf of Mexico" by Norman Kuring [Public Domain] (no alterations) via Wikimedia Commons https://en.wikipedia.org/wiki/File:Sediment_in_the_Gulf_of_Mexico.jpg

seedling
"Stem Leaves Paris Parts Plant" by Unknown [CC0] (no alterations) via Max Pixel https://www.maxpixel.net/Stem-Leaves-Paris-Plants-Leaf-2082612
"Dicotyledoneae Asteraceae herb - root system, primary root becomes tap root and lateral roots" by RoRo [CC0 1.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Dicotyledoneae_Asteraceae_herb_-_root_system,_primary_root_becomes_tap_root_and_lateral_roots.JPG
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/
"Development Germinating" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/en/development-germinating-germination-1300176/

selective breeding
"Puppy Bulldog Dog" by vlaaitje [CC0] (cropped) via Pixabay https://pixabay.com/photos/puppy-bulldog-dog-sweet-pet-1118584/
"Eurasians Medium Spitz-Like" by Couleur [CC0] (cropped) via Pixabay https://pixabay.com/photos/eurasians-medium-spitz-like-dog-2735337/
"Wolf Wild Animal World" by Alexas_Fotos [CC0] (cropped) via Pixabay https://pixabay.com/photos/wolf-wild-animal-animal-world-3151876/
"Mexican Wolf 2 yfb-edit 1" by Clark, Jim (U.S. Fish and Wildlife Service) [Public Domain] (cropped) via Wikimedia Commons https://en.wikipedia.org/wiki/File:Mexican_Wolf_2_yfb-edit_1.jpg
"Zoo Wolf Wild" by 35030 [CC0] (cropped) via Pixabay https://pixabay.com/photos/zoo-wolf-wild-mammal-animal-111178/
"German Shepherd Pet Portrait" by JeanineW [CC0] (cropped) VIA Pixabay https://pixabay.com/photos/german-shepherd-pet-portrait-dogs-3770786/
"Checkmark green" by Nobbler 76 [Public Domain] (no alterations) via Wikimedia Commons https://en.wikipedia.org/wiki/File:Checkmark_green.svg
"Stop Containing Street Sign" by 3dman_eu [CC0] (no alterations) via Pixabay https://pixabay.com/illustrations/stop-containing-street-sign-1013732/

sexual reproduction
"Baby Babyhood Childhood" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/baby-babyhood-childhood-cradle-2023174/
"Reproduction Impregnation" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/reproduction-impregnation-150566/
"DNA mutation" by Mouagip [Public Domain] (recolored, cropped and labels removed) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:DNA_UV_mutation.svg

skeletal system
"Human skeleton back no-text no-color" by LadyOfHats/Mariana Ruiz Villareal [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Human_skeleton_back_no-text_no-color.svg
"Human skeleton front no-text no-color" by LadyOfHats/Mariana Ruiz Villareal [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Human_skeleton_front_no-text_no-color.svg

species
"Amurtiger Tiger Big Cat" by Pixel-mixer [CC0] (cropped) via Pixabay https://pixabay.com/photos/amurtiger-tiger-big-cat-siberian-1975790/
"Puppy Labradoodle Pal" by slipschutz [CC0] (cropped) via Pixabay https://pixabay.com/photos/puppy-labradoodle-pal-friend-dog-5010561/
"Dog, Black Standard Poodle" by Karen Arnold [CC0 Public Domain] (cropped) via PublicDomainPictures https://www.publicdomainpictures.net/en/view-image.php?image=242148&picture=dog-black-standard-poodle
"Labrador Dog Outdoor" by stanze [CC0] (cropped) via Pixabay https://pixabay.com/photos/labrador-dog-outdoor-view-portrait-2121759/
"Cat Kitten Sit" by DarkWorkX [CC0] (cropped) via Pixabay https://pixabay.com/photos/cat-kitten-sit-isolated-red-white-2669554/

stability/stable
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/

stimulus/stimuli
"Plant" by gsagri04 [Public Domain] (cropped and rotated) via Free Stock Photos http://www.freestockphotos.biz/stockphoto/15474
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/en/hot-temperature-thermometer-weather-159386/
"Beauty Face Girl" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/beauty-face-girl-head-portrait-1299249/
"Lamp Light Table" by simisi1 [CC0] (no alterations) via Pixabay https://pixabay.com/en/lamp-light-table-vector-2561267/

structure
"Stem Leaves Paris Parts Plant" by Unknown [CC0] (no alterations) via Max Pixel https://www.maxpixel.net/Stem-Leaves-Paris-Plants-Leaf-2082612
Untitled by Unknown [CC0] (cropped) via Pxhere https://pxhere.com/en/photo/1361285
"Needles Pine Needle" by zoosnow [CC0] (cropped) via Pixabay https://pixabay.com/en/needles-pine-needle-tree-spruce-3357001/

surface water
"Cattails Bulrush Marsh" by plume93 [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/cattails-bulrush-marsh-nature-4257085/

sustainability
This image was created solely by Stephen Fleenor, PhD (Seidlitz Education)

terrestrial
"Soil Earth Excavation" by OpenClipart-Vectors [CC0] (recolored and cropped) via Pixabay https://pixabay.com/vectors/soil-earth-excavation-exposed-575643/
"Mushroom Cartoon Fungus" by basker_Dhandapani [CC0] (no alterations) via Pixabay https://pixabay.com/illustrations/mushroom-cartoon-fungus-vegetable-2844146/
"Zelkova Serrata Tree Bonsai" by Deedster [CC0] (cropped and rotated) via Pixabay https://pixabay.com/en/zelkova-serrata-tree-bonsai-zelkova-1613784/
"Bird Silhouette Flying" by Elionas [CC0] (no alterations) via Pixabay https://pixabay.com/en/bird-silhouette-flying-movement-1314469/
"Deer Male Animal" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/deer-male-animal-mammal-antlers-48417/
"bacteria illness bacterium infection" by Unknown [CC0] (recolored) via SVG Silh https://svgsilh.com/image/156869.html
"Worm Earthworm Nightcrawler" by Clker-Free-Vector-Images [CC0] (rotated) via Pixabay https://pixabay.com/vectors/worm-earthworm-nightcrawler-37662/
"Hornet Wasp Insect" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/hornet-wasp-insect-bee-brown-151003/

thermal energy
"Fire Flames Hell" by Clker-Free-Vector-Images [CC0] (stretched and rotated) via Pixabay https://pixabay.com/vectors/fire-flames-hell-burn-bright-307336/
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (temperature changed) via Pixabay https://pixabay.com/vectors/hot-temperature-thermometer-weather-159386/

thigmotropism
"Vine" by Jon Sullivan [Public Domain] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Vine.jpg
"Fly Housefly Macro Close" by TBIT [CC0] (background removed) via Pixabay https://pixabay.com/photos/fly-housefly-macro-close-up-insect-946712/
"Venus Fly Trap Carnivorous" by jemmaliggett13 [CC0] (cropped) via Pixabay https://pixabay.com/photos/venus-fly-trap-fly-carnivorous-4606879/
"Insect Venus Fly Trap" by Isbbohn [CC0] (cropped) via Pixabay https://pixabay.com/photos/insect-venus-fly-trap-plant-1535990/

tissue
"Digestive system without labels" by LadyOfHats [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Digestive_system_without_labels.svg
"Muscle Tissue: Smooth" by Berkshire Community College Bioscience Image Library [CC0 1.0] (cropped) via Flickr https://www.flickr.com/photos/146824358@N03/40087100490/
"Stomach Muscles Muscle Layers" by LillyCantabile [CC0] (no alterations) via Pixabay https://pixabay.com/illustrations/stomach-muscles-muscle-layers-3329346/
"magnification, 500x, hematoxyllin, eosin, lung, tissue, sample" by Dr. Brachman, USCDCP [Public Domain] (cropped) via Pixnio https://pixnio.com/science/microscopy-images/plague-yersenia-pestis/magnification-of-500x-this-hematoxylin-and-eosin-stained-he-lung-tissue-sample

tornado
"Stump Tree Log" by OpenClipart-Vectors [CC0] (recolored) via Pixabay https://pixabay.com/vectors/stump-tree-log-trunk-cut-nature-576907/
"Storm Stormy Tornado" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/storm-stormy-tornado-weather-159391/
"Green Plants Leafy" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/green-plants-leafy-greenery-576288/
"Dirt Soil Nature" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/dirt-soil-nature-gardening-earth-576619/
"Tree Forest Trunk" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/tree-forest-trunk-nature-leaves-576848/
"Tree Forest Trunk" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/tree-forest-trunk-nature-leaves-576850/
"Plants Green Leaves" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/plants-green-leaves-leafy-greenery-576277/
"Cloud Overcast Weather" by OpenClipat-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/cloud-overcast-weather-159388/
"Wind Energy Renewable" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/wind-energy-renewable-energy-wind-2029621/

trait
"Dog Pet Hovawart" by Chiemsee2016 [CC0] (cropped) via Pixabay https://pixabay.com/photos/dog-pet-hovawart-black-1194087/
"Husky Dog Breed" by pixel2013 [CC0] (cropped) via Pixabay https://pixabay.com/photos/husky-dog-dog-breed-animal-3380548/
"Dog Animal Portrait" by Vizsalafotozas [CC0] (cropped) via Pixabay https://pixabay.com/photos/dog-animal-portrait-pet-brown-3277416/

transfer
"Battery Energy Power" by OpenClipart-Vectors [CC0] (rotated) via Pixabay https://pixabay.com/vectors/battery-energy-power-cell-156718/
"Melt Ice Cube" by Clker-Free-Vector-Images [CC0] (recolored) via Pixabay https://pixabay.com/vectors/melt-ice-cube-ice-melting-blue-25202/
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (temperature changed) via Pixabay https://pixabay.com/vectors/hot-temperature-thermometer-weather-159386/
"Light Torch Lamp" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/light-torch-lamp-electric-159858/
"Rabbit Silhouette Black Isolated" by Gorkhs [CC0] (no alterations) via Pixabay https://pixabay.com/en/rabbit-silhouette-black-2262101/

trophic level
"bacterium h bacterium" by Unknown [CC0] (no alterations) via SVG Silh https://svgsilh.com/image/1455818.html
"bacteria illness bacterium infection" by Unknown [CC0] (no alterations) via SVG Silh https://svgsilh.com/image/156869.html
"Mushroom Cartoon Fungus" by basker_Dhandapani [CC0] (no alterations) via Pixabay https://pixabay.com/illustrations/mushroom-cartoon-fungus-vegetable-2844146/
"Biodiversity Earthworm Fertilizer" by OpenClipart-Vectors [CC0] (rotated) via Pixabay https://pixabay.com/vectors/biodiversity-earthworm-fertilizer-160380/
"Caterpillar Monarch Butterfly" by OpenClipart-Vectors [CC0] (rotated) via Pixabay https://pixabay.com/en/caterpillar-monarch-butterfly-156937/
"Cougar Mountain Lion" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/cougar-mountain-lion-wild-animal-47667/
"Bird" by yves_guillou (OCAL) [Public Domain] (no alterations) via Free Stock Photos http://www.freestockphotos.biz/stockphoto/15184
"Zelkova Serrata Tree Bonsai" by Deedster [CC0] (cropped and rotated) via Pixabay https://pixabay.com/en/zelkova-serrata-tree-bonsai-zelkova-1613784/
"Dandelion Flower Yellow" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/dandelion-flower-yellow-plant-weed-31406/
"Animal Bear Brown" by OpenClipart-Vectors [CC0] (rotated) via Pixabay https://pixabay.com/vectors/animal-bear-brown-cub-cute-hairy-160462/
"Rabbit Silhouette Black Isolated" by Gorkhs [CC0] (no alterations) via Pixabay https://pixabay.com/en/rabbit-silhouette-black-2262101/

tsunami
"Apartment Houses Brick" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/apartment-houses-brick-buildings-159414/
"Tree Forest Trunk" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/tree-forest-trunk-nature-leaves-576848/

vacuole
"Turgor pressure on plant cells diagram" by LadyofHats [Public Domain] (labels removed) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Turgor_pressure_on_plant_cells_diagram.svg
"Rg1024 Set of water drops" by rg1024 [CC0 1.0] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Rg1024_Set_of_water_drops.svg

variation
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/
"Mouse Rodent Rat" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/mouse-rodent-rat-black-cute-296396/
"Gerbil Mouse Rodent" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/gerbil-mouse-rodent-brown-animal-303178/
"DNA mutation" by Mouagip [Public Domain] (recolored, cropped and labels removed) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:DNA_UV_mutation.svg

volcano
"Lava Background Magma" by EriktheGreat [CC0] (cropped and brightened) via Pixabay https://pixabay.com/illustrations/lava-background-magma-nature-hot-499891/
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (temperature changed) via Pixabay https://pixabay.com/vectors/hot-temperature-thermometer-weather-159386/

vomiting
"Symptoms-vomiting" by CDC [Public Domain] (no alterations) via https://commons.wikimedia.org/wiki/File:Symptoms-vomiting.jpg
"Skull and crossbones" by Unknown [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Skull_and_crossbones.svg

water table
"Wishing Well Cartoon" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/well-wishing-well-cartoon-water-38107/

watershed
"Mountain Hill Rock" by OpenClipart-Vectors [CC0] (brightness and contrast adjusted and) via Pixabay https://pixabay.com/vectors/mountain-hill-rock-peak-barren-575618/

wildfire
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/
"Fire Flames Hell" by Clker-Free-Vector-Images [CC0] (stretched and rotated) via Pixabay https://pixabay.com/vectors/fire-flames-hell-burn-bright-307336/
"Tree Forest Trunk" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/tree-forest-trunk-nature-leaves-576848/
"Bare Leafless Plant" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/bare-leafless-plant-tree-winter-1297449/

wilting
"Fungal wilt of papaya: Wilting, chlorosis and necrosis" by Scot Nelson [Public Domain] (cropped) via https://www.flickr.com/photos/scotnelson/9178775090
"Leaf Papaya Green" by thiagolazarino [CC0] (cropped and brightened) via Pixabay https://pixabay.com/photos/leaf-papaya-green-nature-leaves-4763700/
"Rg1024 Set of water drops" by rg1024 [CC0 1.0] via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Rg1024_Set_of_water_drops.svg

xylem
"Stem Leaves Paris Parts Plant" by Unknown [CC0] (no alterations) via Max Pixel https://www.maxpixel.net/Stem-Leaves-Paris-Plants-Leaf-2082612
"Dicotyledoneae Asteraceae herb - root system, primary root becomes tap root and lateral roots" by RoRo [CC0 1.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Dicotyledoneae_Asteraceae_herb_-_root_system,_primary_root_becomes_tap_root_and_lateral_roots.JPG
"Rg1024 Set of water drops" by rg1024 [CC0 1.0] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Rg1024_Set_of_water_drops.svg

8th Grade Science

abiotic
"Sunlight" by consuelo suarez [CC0] (cropped) via PublicDomainPictures https://www.publicdomainpictures.net/en/view-image.php?image=22515&picture=sunlight
"Drops of water liquid" by unknown [CC0] (cropped) via Pixabay https://pixabay.com/en/drops-of-water-water-liquid-fresh-578897/
"Soil" by Mesaytsegaye [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Soil.jpg
"Húsafell Stone" by Pudpon [CC0 1.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:H%C3%BAsafell_Stone.png

absolute magnitude
"Earth Globe Planet" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/earth-globe-planet-world-147591/

abundance
"Cart Shopping Supermarket" by OpenClipart-Vectors [CC0] (rotated) via Pixabay https://pixabay.com/vectors/cart-shopping-supermarket-148964/
"Apple Red Fruit" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/apple-red-fruit-vitamins-healthy-158419/

acceleration
"Stopwatch Racing Timer" by OpenClipart-Vectors [CC0] (second hand removed) via Pixabay https://pixabay.com/vectors/stopwatch-racing-timer-timing-153398/
"Speedometer Tachometer Gauge" by OpenClipart-Vectors [CC0] (needle removed) via Pixabay https://pixabay.com/vectors/speedometer-tachometer-gauge-mph-153399/
"Automobile Car Red" by OpenClipart-Vectors [CC0] (transparency filter applied) via Pixabay https://pixabay.com/vectors/automobile-car-red-french-old-1300467/

adapt/adaptation
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/
"Mouse Rodent Rat" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/mouse-rodent-rat-black-cute-296396/
"Gerbil Mouse Rodent" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/gerbil-mouse-rodent-brown-animal-303178/

air mass
"Earth Globe Planet" by OpenClipart-Vectors [CC0] (brightened and cropped) via Pixabay https://pixabay.com/vectors/earth-globe-planet-world-147591/
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (temperature changed) via Pixabay https://pixabay.com/vectors/hot-temperature-thermometer-weather-159386/
"Rg1024 Set of water drops" by rg1024 [CC0 1.0] via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Rg1024_Set_of_water_drops.svg

apparent magnitude
"Earth Globe Planet" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/earth-globe-planet-world-147591/
"Astronomy Space Telescope" by OpenClipart-Vectors [CC0] (rotated) via Pixabay https://pixabay.com/vectors/astronomy-space-telescope-universe-1294337/

applied force
"Magnet Magnetic Poles Magnetism" by Clker-Free-Vector-Images [CC0] (rotated) via Pixabay https://pixabay.com/vectors/magnet-magnetic-poles-magnetism-297698/
"Tree Apple" by Kjristie [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/tree-apple-apple-tree-nature-fruit-923776/
"Apple Red Fruit" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/apple-red-fruit-vitamins-healthy-158419/
"Crate Box Wooden" by Clker-Free-Vector-Images [CC0] (elongated) via Pixabay https://pixabay.com/vectors/crate-box-wooden-container-package-310787/
"Push Pushing Move Moving" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/push-pushing-move-moving-action-150175/
"Silhouette Relationship Conflict" by mohamed_hassan [CC0] (cropped) via Pixabay https://pixabay.com/vectors/silhouette-relationship-conflict-3141264/

artificial reef
"Artificialreef" by Polylerus [Public Domain] (cropped and human removed) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Artificialreef.JPG
"Coral Collage Vintage" by ArtsyBee [CC0] (cropped) via Pixabay https://pixabay.com/illustrations/coral-collage-vintage-plant-blue-1653752/
"Fish Collage Vintage" by ArtsyBee [CC0] (cropped) via Pixabay https://pixabay.com/illustrations/fish-collage-vintage-ocean-life-1653751/
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/

asthenosphere
"Earth Globe Planet" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/earth-globe-planet-world-147591/
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/hot-temperature-thermometer-weather-159386/
"Lava Background Magma" by EriktheGreat [CC0] (cropped and brightened) via Pixabay https://pixabay.com/illustrations/lava-background-magma-nature-hot-499891/
"Húsafell Stone" by Pudpon [CC0 1.0] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:H%C3%BAsafell_Stone.png

atmosphere
"Earth Globe Planet" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/earth-globe-planet-world-147591/
"Zelkova Serrata Tree Bonsai" by Deedster [CC0] (cropped and rotated) via Pixabay https://pixabay.com/en/zelkova-serrata-tree-bonsai-zelkova-1613784/

atom
"Lithium Atom Isolated" by geralt [CC0] (no alterations) via Pixabay https://pixabay.com/illustrations/lithium-atom-isolated-atomic-2784853/

atomic mass
"Lithium Atom Isolated" by geralt [CC0] (cropped) via Pixabay https://pixabay.com/illustrations/lithium-atom-isolated-atomic-2784853/
"Scales Kitchen Weighing" by Clker-Free-Vector-Images [CC0] (dial rotated) via Pixabay https://pixabay.com/vectors/scales-kitchen-scales-weighing-35902/

atomic number
"Lithium Atom Isolated" by geralt [CC0] (cropped) via Pixabay https://pixabay.com/illustrations/lithium-atom-isolated-atomic-2784853/

average speed
"Automobile Car Red" by OpenClipart-Vectors [CC0] (transparency filter applied) via Pixabay https://pixabay.com/vectors/automobile-car-red-french-old-1300467/
"Stopwatch Racing Timer" by OpenClipart-Vectors [CC0] (second hand removed) via Pixabay https://pixabay.com/vectors/stopwatch-racing-timer-timing-153398/

axis
"Rotating earth (huge)" by The MP [CC BY 3.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Rotating_earth_(huge).gif

balanced force
"Crate Box Wooden" by Clker-Free-Vector-Images [CC0] (elongated) via Pixabay https://pixabay.com/vectors/crate-box-wooden-container-package-310787/
"Push Pushing Move Moving" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/push-pushing-move-moving-action-150175/
"Speedometer Tachometer Gauge" by OpenClipart-Vectors [CC0] (needle removed) via Pixabay https://pixabay.com/vectors/speedometer-tachometer-gauge-mph-153399/
"Automobile Car Red" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/automobile-car-red-french-old-1300467/

big bang
"Hubble Team Unveils Most Colorful View of Universe Captured by Space Telescope" by NASA Goddard [Public Domain] (cropped) via NASA https://images.nasa.gov/details-GSFC_20171208_Archive_e001061.html
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/

biodiversity
"Caterpillar Monarch Butterfly" by OpenClipart-Vectors [CC0] (rotated) via Pixabay https://pixabay.com/en/caterpillar-monarch-butterfly-156937/
"tail seabird nature wildlife" by unknown [CC0] (no alterations) via SVG Silh https://svgsilh.com/image/24432.html
"Bird Silhouette Flying" by Elionas [CC0] (no alterations) via Pixabay https://pixabay.com/en/bird-silhouette-flying-movement-1314469/
"Beaver Animal Rodent" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/beaver-animal-rodent-standing-tail-48437/
"Moose Large Body" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/moose-large-body-animal-mammal-48465/
"Dandelion Flower Yellow" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/dandelion-flower-yellow-plant-weed-31406/
"Beedle Insect Bug" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/beetle-insect-bug-blue-black-legs-34372/
"Cougar Mountain Lion" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/cougar-mountain-lion-wild-animal-47667/
"Forest Trees Oak" by Clker-Free-Vector-Images [CC0] (recolored and cropped) via Pixabay https://pixabay.com/vectors/forest-trees-oak-fir-pine-spruce-31910/
"Rabbit Silhouette Black Isolated" by Gorkhs [CC0] (no alterations) via Pixabay https://pixabay.com/en/rabbit-silhouette-black-2262101/

biotic
"Development Germinating" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/en/development-germinating-germination-1300176/
"Elephant Animal Trunk" by Clker-Free-Vector-Images [CC0] (cropped) via Pixabay https://pixabay.com/en/elephant-animal-trunk-tusks-large-48423/
"Bones Bleached White" by holmespj [CC0] (cropped) via Pixabay https://pixabay.com/photos/bones-bleached-white-death-drought-3670740/
"Ink Red Splatter" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/ink-red-splatter-abstract-paint-303244/

Bohr model
"Lithium Atom Isolated" by geralt [CC0] (cropped) via Pixabay https://pixabay.com/illustrations/lithium-atom-isolated-atomic-2784853/

brightness/luminosity
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (temperature changed) via Pixabay https://pixabay.com/vectors/hot-temperature-thermometer-weather-159386/
"Planet Sun" by ipicgr [CC0] (resized and brightened) via Pixabay https://pixabay.com/illustrations/planet-sun-star-1497205/
"Light Bulb Clip Art Idea" by ArtsyBee [CC0] (brightness altered) via Pixabay https://pixabay.com/illustrations/light-bulb-clip-art-idea-1139405/

camouflage
"Peppered Moth (Biston betularia)" by Ben Sale [CC BY 2.0] (cropped) via Flickr https://www.flickr.com/photos/33398884@N03/5857613284
"Katydid Grasshopper" by Brett_Hondow [CC0] (no alterations) via Pixabay https://pixabay.com/photos/katydid-grasshopper-leaf-grasshopper-449194/

canyon
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/

carnivore
"Cougar Mountain Lion" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/cougar-mountain-lion-wild-animal-47667/
"Rabbit Silhouette Black Isolated" by Gorkhs [CC0] (no alterations) via Pixabay https://pixabay.com/en/rabbit-silhouette-black-2262101/
"Checkmark green" by Nobbler 76 [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Checkmark_green.svg

celestial body
"Earth Globe Planet" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/earth-globe-planet-world-147591/
"Astronomy Space Telescope" by OpenClipart-Vectors [CC0] (rotated) via Pixabay https://pixabay.com/vectors/astronomy-space-telescope-universe-1294337/
"Milky Way Starry Sky Star" by Hans [CC0] (cropped) via Pixabay https://pixabay.com/photos/milky-way-starry-sky-star-galaxies-1655504/
"Moon Planet Outer Space Solar" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/moon-planet-outer-space-26619/
"Saturn Planet Rings" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/saturn-planet-saturn-rings-148300/
"Wallpaper Background Asteroid" by ipicgr [CC0] (background removed) via Pixabay https://pixabay.com/illustrations/wallpaper-background-asteroid-1493366/
"Mars Red Planet Starry" by WikiImages [CC0] (background removed) via Pixabay https://pixabay.com/photos/mars-red-planet-planet-starry-sky-11012/
"Sun Fireball Solar Flare" by WikiImages [CC0] (background removed) via Pixabay https://pixabay.com/photos/sun-fireball-solar-flare-sunlight-11582/
"Space Stars Photoshop" by 1980supra [CC0] (background removed) via Pixabay https://pixabay.com/photos/space-stars-photoshop-nebula-1436951/

chemical change
"Beaker Chemistry Full" by OpenClipart-Vectors [CC0] (recolored) via Pixabay https://pixabay.com/vectors/beaker-chemistry-full-glasswares-159176/

chemical formula
"Baking Soda Box White" by evitaochel [CC0] (cropped) via Pixabay https://pixabay.com/photos/baking-soda-box-white-powder-768950/

chemical property
"Beaker Chemistry Full" by OpenClipart-Vectors [CC0] (recolored) via Pixabay https://pixabay.com/vectors/beaker-chemistry-full-glasswares-159176/
"Fire Flames Hell" by Clker-Free-Vector-Images [CC0] (stretched and rotated) via Pixabay https://pixabay.com/vectors/fire-flames-hell-burn-bright-307336/
"Explosions Pictogram Caution" by Clker-Free-Vector-Images [CC0] (cropped) via Pixabay https://pixabay.com/vectors/explosions-pictogram-caution-danger-28712/
"Fire Flame Flammable" by OpenIcons [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/flame-fire-flammable-inflammable-98645/
"Warning Corrosive Yellow Attention Acid Sign" by unknown [CC0] (no alterations) via Max Pixel https://www.maxpixel.net/Warning-Corrosive-Yellow-Attention-Acid-Sign-98647
"Match Burning Fire" by Clker-Free-Vector-Images [CC0] (rotated and darkened) via Pixabay https://pixabay.com/vectors/match-burning-fire-lit-matchstick-30271/

chemical reaction
"Beaker Chemistry Full" by OpenClipart-Vectors [CC0] (recolored) via Pixabay https://pixabay.com/vectors/beaker-chemistry-full-glasswares-159176/

chemical symbol
This image was created solely by Stephen Fleenor, PhD (Seidlitz Education)

climate
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/hot-temperature-thermometer-weather-159386/
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/
"Wind Energy Renewable" by OpenClipart-Vectors [CC0] (cropped and recolored) via Pixabay https://pixabay.com/vectors/wind-energy-renewable-energy-wind-2029621/
"Weather Icons Cloud" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/weather-icons-cloud-meteorology-160759/
"Water Droplet" by madartzgraphics [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/water-water-droplet-droplet-2072211/

coefficient
"Baking Soda Box White" by evitaochel [CC0] (cropped and brightened) via Pixabay https://pixabay.com/photos/baking-soda-box-white-powder-768950/
"Vinegar Cleaning Cleaner" by evitochel [CC0] (cropped) via Pixabay https://pixabay.com/photos/vinegar-cleaning-cleaner-clean-768948/

cold front
"Map Pin Illustrator" by Clker-Free-Vector-Images [CC0] (recolored) via Pixabay https://pixabay.com/vectors/map-pin-illustrator-holder-place-42871/
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (temperature changed) via Pixabay https://pixabay.com/vectors/hot-temperature-thermometer-weather-159386/

compete/competition
"Fighting Nyalas" by Papphase [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Fighting_Nyalas.JPG
"Hyenas Fight Against Lions Over a Kill HD 12" by Kruger Sightings HD [CC BY 3.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Hyenas_Fight_Against_Lions_Over_a_Kill_HD_12.png
"Steenbock Kruger Deer" by WiseTraveller [CC0] (edges softened) via Pixabay https://pixabay.com/photos/steenbok-kruger-deer-antelope-1364425/

composition
"Drinks Lemon Ade Cool" by eommina [CC0] (no alterations) via Pixabay https://pixabay.com/photos/drinks-lemon-ade-cool-lemonade-1825702/
"Water Glass Drip" by boristrost [CC0] (no alterations) via Pixabay https://pixabay.com/photos/water-glass-drip-drink-clear-1585192/
"Salt Cooking Rock Salt" by moritz320 [CC0] (cropped) via Pixabay https://pixabay.com/photos/salt-cooking-salt-rock-salt-4418749/
"Lemons Yellow Food" by Richardjohn [CC0] (no alterations) via Pixabay https://pixabay.com/photos/lemons-yellow-food-fruit-fresh-2039830/
"Bricks Concrete Rock" by Pexels [CC0] (no alterations) via Pixabay https://pixabay.com/photos/bricks-concrete-rock-stone-1839553/
"Brick Wall Brickwork White" MabelAmber [CC0] (no alterations) via Pixabay https://pixabay.com/photos/brick-wall-wall-brickwork-3079574/

compound
This image was created solely by Stephen Fleenor, PhD (Seidlitz Education)

conduction/conduct
"Light Bulb Lightbulb" by Clker-Free-Vector-Images [CC0] (rotated) via Pixabay https://pixabay.com/vectors/light-bulb-lightbulb-light-bulb-34547/
"Battery Energy Power" by OpenClipart-Vectors [CC0] (rotated) via Pixabay https://pixabay.com/vectors/battery-energy-power-cell-156718/
"cooking, pot, kitchen, stainless, steel, stove" by Marcelo [Public Domain] (cropped) via Pixnio https://pixnio.com/objects/cooking-pot-on-the-kitchen-stove

constant speed
"Stopwatch Racing Timer" by OpenClipart-Vectors [CC0] (second hand removed) via Pixabay https://pixabay.com/vectors/stopwatch-racing-timer-timing-153398/
"Speedometer Tachometer Gauge" by OpenClipart-Vectors [CC0] (needle removed) via Pixabay https://pixabay.com/vectors/speedometer-tachometer-gauge-mph-153399/
"Automobile Car Red" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/automobile-car-red-french-old-1300467/

constant velocity
"Speedometer Tachometer Gauge" by OpenClipart-Vectors [CC0] (needle removed) via Pixabay https://pixabay.com/vectors/speedometer-tachometer-gauge-mph-153399/
"Automobile Car Red" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/automobile-car-red-french-old-1300467/

Continental Drift theory
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/
Untitled by Unknown [Public Domain] (cropped) via USGS https://pubs.usgs.gov/gip/dynamic/historical.html

contour interval
This image was created solely by Stephen Fleenor, PhD (Seidlitz Education)

convection current
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (temperature changed) via Pixabay https://pixabay.com/vectors/hot-temperature-thermometer-weather-159386/
"Lava Background Magma" by EriktheGreat [CC0] (cropped and brightened) via Pixabay https://pixabay.com/illustrations/lava-background-magma-nature-hot-499891/
"Illustration depicting the overturning circulation of the global ocean." by NASA/JPL [Public Domain] (no alterations) via NASA Jet Propulsion Laboratory https://www.jpl.nasa.gov/news/news.php?release=2010-101

convergent boundary
"Lava Background Magma" by EriktheGreat [CC0] (cropped and brightened) via Pixabay https://pixabay.com/illustrations/lava-background-magma-nature-hot-499891/

Coriolis effect
"Earth Globe Planet" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/earth-globe-planet-world-147591/
"Wind Energy Renewable" by OpenClipart-Vectors [CC0] (cropped and recolored) via Pixabay https://pixabay.com/vectors/wind-energy-renewable-energy-wind-2029621/

crater
"Earth Globe Planet" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/earth-globe-planet-world-147591/
"Moon Planet Outer Space Solar" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/moon-planet-outer-space-26619/
"Wallpaper Background Asteroid" by ipicgr [CC0] (background removed) via Pixabay https://pixabay.com/illustrations/wallpaper-background-asteroid-1493366/
"Crater Volcano Hawaii Haleakala" by Pexels [CC0] (cropped) via Pixabay https://pixabay.com/photos/crater-volcano-hawaii-1846775/
"Moon Craters Crater" by WikiImages [CC0] (cropped) via Pixabay https://pixabay.com/photos/moon-moon-craters-crater-508756/

crust
"Earth Globe Planet" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/earth-globe-planet-world-147591/

depend/dependence
"Bees Insects Blossom" by Buntysmum [CC0] (cropped) via Pixabay https://pixabay.com/photos/bees-insects-blossom-blackberry-4003580/
"Animal Bear Collection" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/animal-bear-collection-silhouettes-1297864/
"Tortoise Feeding Animal" by MemoryCatcher [CC0] (no alterations) via Pixabay https://pixabay.com/photos/tortoise-feeding-animal-wildlife-2311869/
"Smiley Face Smile" by PixLoger [CC0] (recolored) via Pixabay https://pixabay.com/en/smiley-face-smile-good-nice-3189739/

deposition
"Beach Desert Dune Sand" by OpenClipart-Vectors [CC0] (dune erased) via Pixabay https://pixabay.com/vectors/beach-desert-dune-sand-157340/
"Wind Energy Renewable" by OpenClipart-Vectors [CC0] (cropped and recolored) via Pixabay https://pixabay.com/vectors/wind-energy-renewable-energy-wind-2029621/
"Húsafell Stone" by Pudpon [CC0 1.0] (cropped and recolored) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:H%C3%BAsafell_Stone.png

displacement
"Automobile Car Red" by OpenClipart-Vectors [CC0] (transparency filter applied) via Pixabay https://pixabay.com/vectors/automobile-car-red-french-old-1300467/

dissolve/dissolution
"Beaker Chemistry Empty" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/beaker-chemistry-empty-glasswares-159174/

distance
"Automobile Car Red" by OpenClipart-Vectors [CC0] (transparency filter applied) via Pixabay https://pixabay.com/vectors/automobile-car-red-french-old-1300467/

divergent boundary
"Lava Background Magma" by EriktheGreat [CC0] (cropped and brightened) via Pixabay https://pixabay.com/illustrations/lava-background-magma-nature-hot-499891/

earthquake
"Apartment Houses Brick" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/apartment-houses-brick-buildings-159414/

eclipse
"Earth Globe Planet" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/earth-globe-planet-world-147591/
"Moon Planet Outer Space Solar" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/moon-planet-outer-space-26619/
"Solar Eclipse Sun Flare" by Buddy_Nah [CC0] via Pixabay https://pixabay.com/photos/solar-eclipse-sun-flare-solar-1482921/
"Moon Astronomy Luna" by ktphotography [CC0] via Pixabay https://pixabay.com/photos/moon-astronomy-luna-lunar-eclipse-3182407/

ecosystem
"Rabbit Silhouette Black Isolated" by Gorkhs [CC0] (recolored) via Pixabay https://pixabay.com/en/rabbit-silhouette-black-2262101/
"Moose Large Body" by Clker-Free-Vector-Images [CC0] (recolored) via Pixabay https://pixabay.com/en/moose-large-body-animal-mammal-48465/
"Caterpillar Monarch Butterfly" by OpenClipart-Vectors [CC0] (recolored) via Pixabay https://pixabay.com/en/caterpillar-monarch-butterfly-156937/
"Pond Water Outdoor" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/pond-water-outdoor-grass-outdoors-310149/
"Cougar Mountain Lion" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/cougar-mountain-lion-wild-animal-47667/

El Niño
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (temperature changed) via Pixabay https://pixabay.com/vectors/hot-temperature-thermometer-weather-159386/
"Weather Icons Cloud" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/weather-icons-cloud-meteorology-160759/
"Map of the Pacific region" by Inductiveload [Public Domain] via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Map_of_the_Pacific_region.svg

electrical charge
"Lithium Atom Isolated" by geralt [CC0] (cropped) via Pixabay https://pixabay.com/illustrations/lithium-atom-isolated-atomic-2784853/

electromagnetic radiation
"Planet Sun" by ipicgr [CC0] (no alterations) via Pixabay https://pixabay.com/illustrations/planet-sun-star-1497205/
"Lithium Atom Isolated" by geralt [CC0] (no alterations) via Pixabay https://pixabay.com/illustrations/lithium-atom-isolated-atomic-2784853/
"Magnet Magnetic Poles Magnetism" by Clker-Free-Vector-Images [CC0] (rotated) via Pixabay https://pixabay.com/vectors/magnet-magnetic-poles-magnetism-297698/
"Electromagnetic Waves Wave-Length" by helder100 [CC0] (cropped) via Pixabay https://pixabay.com/vectors/electromagnetic-waves-wave-length-1526374/

electromagnetic spectrum
"Lithium Atom Isolated" by geralt [CC0] (cropped) via Pixabay https://pixabay.com/illustrations/lithium-atom-isolated-atomic-2784853/
"Broadcast Tower Radio" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/broadcast-tower-radio-wave-297434/
"Microwave Appliance Cooking" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/microwave-appliance-cooking-oven-29109/
"Infrared image of a cow" by Craig Packer acquired from USDA ARS [Public Domain] (no alterations) via Pixabay http://www.freestockphotos.biz/stockphoto/10090
"UV light detection" by Airman st Class Micaiah Anthony [Public Domain] (cropped and brightened) via US Air Force https://www.acc.af.mil/News/Art/igphoto/2000150965/
"Diagnosis Xray Chest" by oracast [CC0] (no alterations) via Pixabay https://pixabay.com/photos/diagnosis-xray-chest-lungs-ribs-1476620/

electron
"Lithium Atom Isolated" by geralt [CC0] (cropped) via Pixabay https://pixabay.com/illustrations/lithium-atom-isolated-atomic-2784853/
"Scales Kitchen Weighing" by Clker-Free-Vector-Images [CC0] (dial rotated) via Pixabay https://pixabay.com/vectors/scales-kitchen-scales-weighing-35902/

electron cloud
"Lithium Atom Isolated" by geralt [CC0] (cropped) via Pixabay https://pixabay.com/illustrations/lithium-atom-isolated-atomic-2784853/

element
Untitled by unknown [CC0] (no alterations) via Pxhere https://pxhere.com/en/photo/666730

elevation
"Mountain Hill Rock" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/mountain-hill-rock-peak-barren-575618/

energy level
This image was created solely by Stephen Fleenor, PhD (Seidlitz Education)

environment
"Rabbit Silhouette Black Isolated" by Gorkhs [CC0] (recolored) via Pixabay https://pixabay.com/en/rabbit-silhouette-black-2262101/
"Moose Large Body" by Clker-Free-Vector-Images [CC0] (recolored) via Pixabay https://pixabay.com/en/moose-large-body-animal-mammal-48465/
"Caterpillar Monarch Butterfly" by OpenClipart-Vectors [CC0] (recolored) via Pixabay https://pixabay.com/en/caterpillar-monarch-butterfly-156937/
"Pond Water Outdoor" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/pond-water-outdoor-grass-outdoors-310149/
"Human body silhouette" by Mikael Häggström [Public Domain] (recolored) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Human_body_silhouette.svg

equator
"Earth Globe Planet" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/earth-globe-planet-world-147591/

equinox
"Earth Globe Planet" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/earth-globe-planet-world-147591/
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/

erosion
"Mountain Hill Rock" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/mountain-hill-rock-peak-barren-575618/
"Wind Energy Renewable" by OpenClipart-Vectors [CC0] (cropped and recolored) via Pixabay https://pixabay.com/vectors/wind-energy-renewable-energy-wind-2029621/
"Cloud Overcast Weather" by OpenClipat-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/cloud-overcast-weather-159388/
"Rain Cloud Nature" by Clker-Free-Vector-Images [CC0] (cropped) via Pixabay https://pixabay.com/vectors/rain-cloud-nature-weather-sky-310148/

extinct
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/
"Frog Amphibian Tropical" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/frog-amphibian-tropical-rainforest-46403/

family/group (Periodic Table)
This image was created solely by Stephen Fleenor, PhD (Seidlitz Education)

fault
"Piqiang Fault, China detail" by Robert Simmon and Jesse Allen, NASA Earth Observatory [Public Domain] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Piqiang_Fault,_China_detail.jpg
"Aerial-SanAndreas-CarrizoPlain" by John Wiley [CC BY 3.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Aerial-SanAndreas-CarrizoPlain.jpg
"Satellite Soyuz Spaceship Space" by Alexas_Fotos [CC0] (no alterations) via Pixabay https://pixabay.com/photos/satellite-soyuz-spaceship-2771043/

feature
"Rhinocerous Beetle Nature" by RolandKuck [CC0] (no alterations) via Pixabay https://pixabay.com/en/rhinoceros-beetle-nature-free-1974362/
"Giraffe Nature Africa" by OpenClipart-Vectors [CC0] (neck and legs shortened) via Pixabay https://pixabay.com/vectors/giraffe-nature-africa-safari-152607/
"Beetle Rhino Insect" by Romario99 [CC0] (cropped and rotated) via Pixabay https://pixabay.com/photos/beetle-rhino-insect-nature-macro-4488578/

fertilizer
"Sapling Plant Growing" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/sapling-plant-growing-seedling-154734/
"Garden Pot Fertilizer Seeds" by AnnaliseArt [CC0] (cropped) via Pixabay https://pixabay.com/illustrations/garden-pot-fertilizer-seeds-4290627/
"Compost Garbage Biological" by Couleur [CC0] (cropped) via Pixabay https://pixabay.com/photos/compost-garbage-biological-waste-3663514/

force
"Magnet Magnetic Poles Magnetism" by Clker-Free-Vector-Images [CC0] (rotated) via Pixabay https://pixabay.com/vectors/magnet-magnetic-poles-magnetism-297698/
"Tree Apple" by Kjristie [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/tree-apple-apple-tree-nature-fruit-923776/
"Apple Red Fruit" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/apple-red-fruit-vitamins-healthy-158419/
"Crate Box Wooden" by Clker-Free-Vector-Images [CC0] (elongated) via Pixabay https://pixabay.com/vectors/crate-box-wooden-container-package-310787/
"Push Pushing Move Moving" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/push-pushing-move-moving-action-150175/
"Silhouette Relationship Conflict" by mohamed_hassan [CC0] (cropped) via Pixabay https://pixabay.com/vectors/silhouette-relationship-conflict-3141264/

fossil
"Soil Earth Excavation" by OpenClipart-Vectors [CC0] (recolored and cropped) via Pixabay https://pixabay.com/vectors/soil-earth-excavation-exposed-575643/
"Lizard Gecko Dragon" by Clker-Free-Vector-Images [CC0] (cropped and rotated) via Pixabay https://pixabay.com/vectors/lizard-gecko-dragon-animal-cartoon-23157/
"Dinosaur Lizard Fossil" by Petr Kratochvil [CC0] (cropped and rotated) via Needpix https://www.needpix.com/photo/1384234/dinosaur-lizard-fossil-old-ancient-stone-nature-rock-geology
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/

frequency
"Stopwatch Racing Timer" by OpenClipart-Vectors [CC0] (second hand removed) via Pixabay https://pixabay.com/vectors/stopwatch-racing-timer-timing-153398/

friction
"Kick Soccer Man" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/kick-soccer-man-black-people-149618/

frictionless
"Kick Soccer Man" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/kick-soccer-man-black-people-149618/

galaxy
"Messier 81 HST" by NASA, ESA and the Hubble Heritage Team (STScI/AURA) [Public Domain] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Messier_81_HST.jpg
"Hubble Views a Young Elliptical Galaxy (22754376897)" by NASA Goddard Space Flight Center [Public Domain] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Hubble_Views_a_Young_Elliptical_Galaxy_(22754376897).jpg
"Irregular galaxy NGC 1427A (captured by the Hubble Space Telescope)" by NASA, ESA and the Hubble Heritage Team (STScI/AURA) [Public Domain] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Irregular_galaxy_NGC_1427A_(captured_by_the_Hubble_Space_Telescope).jpg

gravitational constant
"Pilates Pilate Ball" by CoxinhaFotos [CC0] (cropped, recolored, and brightness adjusted) via Pixabay https://pixabay.com/vectors/pilates-pilate-ball-sphere-2137509/
"Grass Meadow Green" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/grass-meadow-green-agriculture-159804/

gravity
"Pilates Pilate Ball" by CoxinhaFotos [CC0] (cropped, recolored, and brightness adjusted) via Pixabay https://pixabay.com/vectors/pilates-pilate-ball-sphere-2137509/
"Full Moon Bright" by dunc [CC0] (cropped) via Pixabay https://pixabay.com/photos/full-moon-moon-bright-sky-space-496873/
"The Earth Terrestrial Globe Planet" by janeb [CC0] (cropped) via Pixabay https://pixabay.com/illustrations/the-earth-terrestrial-globe-planet-1179212/
"Grass Meadow Green" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/grass-meadow-green-agriculture-159804/

hemisphere
"Rotating earth (huge)" by The MP [CC BY 3.0] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Rotating_earth_(huge).gif

herbivore
"Deer Male Animal" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/deer-male-animal-mammal-antlers-48417/
"Rabbit Silhouette Black Isolated" by Gorkhs [CC0] (no alterations) via Pixabay https://pixabay.com/en/rabbit-silhouette-black-2262101/
"Checkmark green" by Nobbler 76 [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Checkmark_green.svg

Hertzsprung‐Russell diagram
This image was created solely by Stephen Fleenor, PhD (Seidlitz Education)

host
"Remora and shark" by Brian Snelson [CC BY 2.0] (no alterations) via Flickr https://www.flickr.com/photos/exfordy/2950573720
"Mosquito Biting Female" by 272447 [CC0] (no alterations) via Pixabay https://pixabay.com/photos/mosquito-biting-female-parasite-542156/

humidity
"Water Droplet" by madartzgraphics [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/water-water-droplet-droplet-2072211/
"Zelkova Serrata Tree Bonsai" by Deedster [CC0] (cropped and rotated) via Pixabay https://pixabay.com/en/zelkova-serrata-tree-bonsai-zelkova-1613784/

hurricane
"Rain Cloud Nature" by Clker-Free-Vector-Images [CC0] (cropped) via Pixabay https://pixabay.com/vectors/rain-cloud-nature-weather-sky-310148/
"GOES-16 image of hurricanes Katia, Irma and Jose on September 8, 2017" by NOAA [Public Domain] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:GOES-16_image_of_hurricanes_Katia,_Irma_and_Jose_on_September_8,_2017.jpg
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (temperature changed) via Pixabay https://pixabay.com/vectors/hot-temperature-thermometer-weather-159386/

inertia
"Crate Box Wooden" by Clker-Free-Vector-Images [CC0] (elongated) via Pixabay https://pixabay.com/vectors/crate-box-wooden-container-package-310787/
"Push Pushing Move Moving" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/push-pushing-move-moving-action-150175/

jet stream
"Jet streams occur in both hemipsheres." by Unknown [Public Domain] (recolored and labels removed) via US Dept of Commerce https://www.weather.gov/jetstream/jet
"North hemisphere cross section showing jet streams and tropopause elevations." by Unknown [Public Domain] (recolored and labels removed) via US Dept of Commerce https://www.weather.gov/jetstream/jet
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (temperature changed) via Pixabay https://pixabay.com/vectors/hot-temperature-thermometer-weather-159386/

La Niña
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (temperature changed) via Pixabay https://pixabay.com/vectors/hot-temperature-thermometer-weather-159386/
"Weather Icons Cloud" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/weather-icons-cloud-meteorology-160759/
"Map of the Pacific region" by Inductiveload [Public Domain] via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Map_of_the_Pacific_region.svg

landform
"Mt Fuji Volcano Foggy" by kimura2 [CC0] (cropped) via Pixabay https://pixabay.com/photos/mt-fuji-volcano-foggy-mountain-477832/
"Tuscany Panorama Landscape" by Schwoaze [CC0] (cropped) via Pixabay https://pixabay.com/photos/tuscany-panorama-landscape-forest-3364498/
"Namibia Desert Sand" by FuN_Lucky [CC0] (cropped) via Pixabay https://pixabay.com/photos/namibia-desert-sand-dune-dust-2049203/
"Landscape Mountains Valleys" by Free-Photos (cropped) via Pixabay https://pixabay.com/photos/landscape-mountains-valleys-hills-691374/
"Canyon, north eastern Kurdistan" by Jim Gordon [CC BY 2.0] via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Canyon,_north_eastern_Kurdistan.jpg
"Mouths of amazon geocover 1990" by NASA [Public Domain] (no alterations) via Wikipedia https://hif.m.wikipedia.org/wiki/file:Mouths_of_amazon_geocover_1990.png

Law of Action-Reaction
"Hand Click Here" by 905513 [CC0] (cropped and rotated) via Pixabay https://pixabay.com/illustrations/hand-click-click-here-finger-touch-1367746/
"Crate Box Wooden" by Clker-Free-Vector-Images [CC0] (elongated) via Pixabay https://pixabay.com/vectors/crate-box-wooden-container-package-310787/
"Silhouette Relationship Conflict" by mohamed_hassan [CC0] (cropped) via Pixabay https://pixabay.com/vectors/silhouette-relationship-conflict-3141264/
"Rocket Missile Lift-Off" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/rocket-missile-lift-off-start-fire-146104/
"Button The Icon Web" by 1117826 [CC0] (rotated and recolored) via Pixabay https://pixabay.com/vectors/button-the-button-icon-web-pages-850101/

Law of Conservation of Mass
"Scales Kitchen Weighing" by Clker-Free-Vector-Images [CC0] (dial rotated) via Pixabay https://pixabay.com/vectors/scales-kitchen-scales-weighing-35902/

Law of Force and Acceleration
"Weights Kilogram Kilo" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/weights-kilogram-kilo-metal-mass-157664/
"Hand Click Here" by 905513 [CC0] (cropped and rotated) via Pixabay https://pixabay.com/illustrations/hand-click-click-here-finger-touch-1367746/

Law of Inertia
"Kick Soccer Man" by OpenClipart-Vectors [CC0] (rotated) via Pixabay https://pixabay.com/vectors/kick-soccer-man-black-people-149618/

light wave
"Rainbow Faded Colors" by Modman [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/rainbow-faded-colors-colorful-772324/
"Man Standing Person" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/man-standing-person-male-adult-309030/
"Bush Green Shrub" by OpenClipart-Vectors [CC0] (darkened) via Pixabay https://pixabay.com/vectors/bush-green-shrub-grass-lush-plant-575513/
"Tree Apple" by Kjristie [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/tree-apple-apple-tree-nature-fruit-923776/
"Illumination Lamp Obsolete Old" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/illumination-lamp-obsolete-1296362/

lithosphere
"Earth Globe Planet" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/earth-globe-planet-world-147591/

long‐term environmental change
"Grass Meadow Green" by OpenClipart-Vectors [CC0] (recolored) via Pixabay https://pixabay.com/vectors/grass-meadow-green-agriculture-159804/
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (temperature changed) via Pixabay https://pixabay.com/vectors/hot-temperature-thermometer-weather-159386/
"Squirrel Animal" by harshal07 [CC0] (rotated) via Pixabay https://pixabay.com/vectors/squirrel-animal-pet-1456764/
"Lab Mouse Science" by mcmurryjulie [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/lab-mouse-mouse-science-lab-animal-1471870/
"Mouse Gray Small" by Clker-Free-Vector-Images [CC0] (rotated) via Pixabay https://pixabay.com/vectors/mouse-gray-small-animal-tail-48374/

lunar cycle
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/
"Moon Planet Outer Space Solar" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/moon-planet-outer-space-26619/
"Earth Globe Planet" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/earth-globe-planet-world-147591/

magma
"Lava Background Magma" by EriktheGreat [CC0] (cropped and brightened) via Pixabay https://pixabay.com/illustrations/lava-background-magma-nature-hot-499891/
"Húsafell Stone" by Pudpon [CC0 1.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:H%C3%BAsafell_Stone.png
"Earth Globe Planet" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/earth-globe-planet-world-147591/

mass
"Scales Kitchen Weighing" by Clker-Free-Vector-Images [CC0] (dial rotated) via Pixabay https://pixabay.com/vectors/scales-kitchen-scales-weighing-35902/
"Pilates Pilate Ball" by CoxinhaFotos [CC0] (cropped, recolored, and brightness adjusted) via Pixabay https://pixabay.com/vectors/pilates-pilate-ball-sphere-2137509/
"Full Moon Bright" by dunc [CC0] (cropped) via Pixabay https://pixabay.com/photos/full-moon-moon-bright-sky-space-496873/
"The Earth Terrestrial Globe Planet" by janeb [CC0] (cropped) via Pixabay https://pixabay.com/illustrations/the-earth-terrestrial-globe-planet-1179212/
"Weights Kilogram Kilo" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/weights-kilogram-kilo-metal-mass-157664/
"Balance Scale Weight" by OpenClipart-Vectors [CC0] (recolored) via Pixabay https://pixabay.com/vectors/balance-scale-weight-kitchen-154266/

mass number
"Lithium Atom Isolated" by geralt [CC0] (cropped) via Pixabay https://pixabay.com/illustrations/lithium-atom-isolated-atomic-2784853/
"Scales Kitchen Weighing" by Clker-Free-Vector-Images [CC0] (dial rotated) via Pixabay https://pixabay.com/vectors/scales-kitchen-scales-weighing-35902/

metal
"Antimony (Mexico) 2" by James St. John [CC BY 2.0] (brightened) via Flickr https://www.flickr.com/photos/jsjgeology/17150760398
"Copper (29 Cu)" by Hi-Res Images of Chemical Elements [CC BY 3.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Copper_(29_Cu).jpg

metalloid
"5 B Boron" by Hi-Res Images of Chemical Elements [CC BY 3.0] (no alterations) via Images-of-Elements http://images-of-elements.com/boron.php

mid‐ocean ridge
"Lava Background Magma" by EriktheGreat [CC0] (cropped and brightened) via Pixabay https://pixabay.com/illustrations/lava-background-magma-nature-hot-499891/
"Húsafell Stone" by Pudpon [CC0 1.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:H%C3%BAsafell_Stone.png
"World Map" by Clker-Free-Vector-Images [[CC0] (no alterations) via Pixabay https://pixabay.com/vectors/world-map-world-map-earth-global-297315/
Untitled by NOAA [Public Domain] (no alterations) via NOAA https://oceanservice.noaa.gov/facts/midoceanridge.html

model
"Pilates Pilate Ball" by CoxinhaFotos [CC0] (cropped, recolored, and brightness adjusted) via Pixabay https://pixabay.com/vectors/pilates-pilate-ball-sphere-2137509/
"Light Torch Lamp" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/light-torch-lamp-electric-159858/
"Fish Aquarium Sea" by visavietnam [CC0] (no alterations) via Pixabay https://pixabay.com/photos/fish-aquarium-sea-fish-tank-288988/
"Marine food web" by Siyavula Education [CC BY 2.0] (no alterations) via Flickr https://www.flickr.com/photos/121935927@N06/13578843423
"Crescent Moon Lunar" by Free-Photos [CC0] (brightness adjusted) via Pixabay https://pixabay.com/photos/crescent-moon-lunar-918793/

molecule
"Animal mitochondrion diagram unlabeled" by LadyofHats [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Animal_mitochondrion_diagram_unlabelled.svg

motion/move/movement
"Boy Female Girl" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/boy-female-girl-human-jumping-2029800/
"Silhouette Black Jumping" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/silhouette-black-jumping-man-guy-32193/
"People Walking Silhouette" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/people-walking-silhouette-black-33483/
"Bouncing Jump Child" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/bouncing-jump-child-girl-159517/

mountain range
"Satellite Soyuz Spaceship Space" by Alexas_Fotos [CC0] (no alterations) via Pixabay https://pixabay.com/photos/satellite-soyuz-spaceship-2771043/
"Kingscanyon l7 2002262 lrg" by Jesse Allen [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Kingscanyon_l7_2002262_lrg.jpg
"Mountains Snow Mountain range" by Itaya Lightbourne [CC0] (cropped) via Needpix https://www.needpix.com/photo/1433898/mountains-snow-mountainrange-pacificnorthwest-washington-washingtonstate-usa-nature-panoramic

neap tide
"Moon Planet Outer Space Solar" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/moon-planet-outer-space-26619/
"Earth Globe Planet" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/earth-globe-planet-world-147591/
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/

net force
"Crate Box Wooden" by Clker-Free-Vector-Images [CC0] (elongated) via Pixabay https://pixabay.com/vectors/crate-box-wooden-container-package-310787/
"Push Pushing Move Moving" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/push-pushing-move-moving-action-150175/

neutron
"Lithium Atom Isolated" by geralt [CC0] (cropped) via Pixabay https://pixabay.com/illustrations/lithium-atom-isolated-atomic-2784853/
"Scales Kitchen Weighing" by Clker-Free-Vector-Images [CC0] (dial rotated) via Pixabay https://pixabay.com/vectors/scales-kitchen-scales-weighing-35902/

Newton (N)
"Weights Kilogram Kilo" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/weights-kilogram-kilo-metal-mass-157664/
"Ruler Measure Measurement" by UnboxScience [CC0] (cropped and rotated) via Pixabay https://pixabay.com/illustrations/ruler-measure-measurement-tool-908891/
"Hand Click Here" by 905513 [CC0] (cropped and rotated) via Pixabay https://pixabay.com/illustrations/hand-click-click-here-finger-touch-1367746/

niche
"Bees Insects Blossom" by Buntysmum [CC0] (cropped) via Pixabay https://pixabay.com/photos/bees-insects-blossom-blackberry-4003580/
"Earthworms The Frog’s Perspective After the Rain" by unknown [CC0] (cropped) via Max Pixel https://www.maxpixels.net/Earthworms-After-The-Rain-The-Frogs-Perspective-2773457https://nv.wikipedia.org/wiki/Eʼelyaaígíí:Earthworm_on_stone.jpg

noble gas
"Smiley Face Average" by PixLoger [CC0] (no alterations) via Pixabay https://pixabay.com/en/smiley-face-average-okay-3189736/

nonmetal
"Sulfur-sample" by Ben Mills [Public Domain] (cropped) via Wikimedia Commons https://en.wikipedia.org/wiki/File:Sulfur-sample.jpg
"Arsenic (Andreasberg, Harz Mountains, Germany) 1" by James St. John [CC BY 2.0] (no alterations) via Flickr https://www.flickr.com/photos/jsjgeology/17508918772

nucleus (atomic)
"Lithium Atom Isolated" by geralt [CC0] (orbital lines brightened) via Pixabay https://pixabay.com/illustrations/lithium-atom-isolated-atomic-2784853/

nutrients
"Medicine Pills Bottles" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/medicine-pills-bottles-medical-296966/
"Boy Human Male" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/boy-human-male-man-people-person-2025115/
"Baby Babyhood Childhood" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/baby-babyhood-childhood-cradle-2023174/
"Vegetable Carrot Food" by dbreen [CC0] (no alterations) via Pixabay https://pixabay.com/photos/vegetables-carrot-food-healthy-1085063/

ocean tide
"Moon Planet Outer Space Solar" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/moon-planet-outer-space-26619/
"Rotating earth (huge)" by The MP [CC BY 3.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Rotating_earth_(huge).gif
"Rocks Coastline Cornwall" by laroberts58 [CC0] (cropped) via Pixabay https://pixabay.com/photos/rocks-coastline-cornwall-sea-wave-1317716/
"Rhine River Low Tide" by distel2610 [CC0] (cropped) via Pixabay https://pixabay.com/photos/rhine-river-low-tide-waters-3596913/

omnivore
"Brown Bear Standing" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/brown-bear-standing-animal-fur-48446/
"Rabbit Silhouette Black Isolated" by Gorkhs [CC0] (no alterations) via Pixabay https://pixabay.com/en/rabbit-silhouette-black-2262101/
"Checkmark green" by Nobbler 76 [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Checkmark_green.svg

orbit
"Earth Globe Planet" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/earth-globe-planet-world-147591/

organism
"Brown Bear Standing" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/brown-bear-standing-animal-fur-48446/
"Protozoan Microbes Biology" by dbutlerdidit [CC0] (no alterations) via Pixabay https://pixabay.com/illustrations/protozoans-microbes-biology-science-1450090/
"Zelkova Serrata Tree Bonsai" by Deedster [CC0] (cropped and rotated) via Pixabay https://pixabay.com/en/zelkova-serrata-tree-bonsai-zelkova-1613784/
"Beedle Insect Bug" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/beetle-insect-bug-blue-black-legs-34372/
"Stem Leaves Paris Parts Plant" by Unknown [CC0] (no alterations) via Max Pixel https://www.maxpixel.net/Stem-Leaves-Paris-Plants-Leaf-2082612
"Mushroom Cartoon Fungus" by basker_Dhandapani [CC0] (no alterations) via Pixabay https://pixabay.com/illustrations/mushroom-cartoon-fungus-vegetable-2844146/
"Rock Stone Moos" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/rock-stone-moos-moss-158022/

parasitism/parasite
"Smiley Face Smile" by PixLoger [CC0] (no alterations) via Pixabay https://pixabay.com/en/smiley-face-smile-good-nice-3189739/
"Smiley Face Bad" by PixLoger [CC0] (no alterations) via Pixabay https://pixabay.com/en/smiley-face-bad-sad-3189737/
"Mosquito Biting Female" by 272447 [CC0] (no alterations) via Pixabay https://pixabay.com/photos/mosquito-biting-female-parasite-542156/

particle
"Beaker Chemistry Empty" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/beaker-chemistry-empty-glasswares-159174/

pattern
This image was created solely by Stephen Fleenor, PhD (Seidlitz Education)

period (Periodic Table)
This image was created solely by Stephen Fleenor, PhD (Seidlitz Education)

Periodic Table of the Elements
This image was created solely by Stephen Fleenor, PhD (Seidlitz Education)

phase
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/
"Adult Age Baby" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/adult-age-baby-child-death-human-2028245/

photosynthesis
"Zelkova Serrata Tree Bonsai" by Deedster [CC0] (cropped, rotated and brightened) via Pixabay https://pixabay.com/en/zelkova-serrata-tree-bonsai-zelkova-1613784/
"Rg1024 Set of water drops" by rg1024 [CC0 1.0] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Rg1024_Set_of_water_drops.svg

physical change
"Melt Ice Cube" by Clker-Free-Vector-Images [CC0] (recolored) via Pixabay https://pixabay.com/vectors/melt-ice-cube-ice-melting-blue-25202/

physical property
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/en/hot-temperature-thermometer-weather-159386/
"Slippery Wet Floor Danger" by OpenIcons [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/slippery-wet-floor-danger-warning-98821/
"Experiment Chemistry Liquid" by PublicDomainPictures [CC0] (cropped) via Pixabay https://pixabay.com/photos/experiment-chemistry-liquid-220023/

planet
"Planet Sun" by ipicgr [CC0] (no alterations) via Pixabay https://pixabay.com/illustrations/planet-sun-star-1497205/
"Earth Globe Planet" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/earth-globe-planet-world-147591/
"Galilean Monde" by WikiImages [CC0] (cropped) via Pixabay https://pixabay.com/photos/jupiter-planet-galilean-monde-io-11615/
"Saturn Planet Rings" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/saturn-planet-saturn-rings-148300/
"Jupiter Planet Space" by TheDigitalArtist [CC0] (no alterations) via Pixabay https://pixabay.com/illustrations/jupiter-planet-space-astronomy-942558/

population
"Rabbit Silhouette Black Isolated" by Gorkhs [CC0] (recolored) via Pixabay https://pixabay.com/en/rabbit-silhouette-black-2262101/
"Deer Male Animal" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/deer-male-animal-mammal-antlers-48417/

precipitate
"Beaker Chemistry Full" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/beaker-chemistry-full-glasswares-159176/

predator/prey
"Dead mouse" by Madprime [CC0 1.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Dead_mouse.svg
"Mouse" by Madprime (assumed) [CC0 1.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Mouse.svg
"Cougar Mountain Lion" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/cougar-mountain-lion-wild-animal-47667/

pressure
"Clamp Vice Grip" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/clamp-vice-grip-clasp-hold-tool-311532/

pressure system
"Weather Icons Cloud" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/weather-icons-cloud-meteorology-160759/
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (temperature changed) via Pixabay https://pixabay.com/vectors/hot-temperature-thermometer-weather-159386/

prevailing winds
"Earth Globe Planet" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/earth-globe-planet-world-147591/
"Wind Energy Renewable" by OpenClipart-Vectors [CC0] (cropped and recolored) via Pixabay https://pixabay.com/vectors/wind-energy-renewable-energy-wind-2029621/

product
"Zelkova Serrata Tree Bonsai" by Deedster [CC0] (cropped and rotated) via Pixabay https://pixabay.com/en/zelkova-serrata-tree-bonsai-zelkova-1613784/
"Húsafell Stone" by Pudpon [CC0 1.0] (rotated) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:H%C3%BAsafell_Stone.png
"Sports Car Classic Racing" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/sports-car-classic-car-racing-car-146185/
"Beaker Experiment Bubbles" by OpenClipart-Vectors [CC0] (recolored) via Pixabay https://pixabay.com/vectors/beaker-experiment-bubbles-chemistry-148167/
"Baking Soda Box White" by evitaochel [CC0] (cropped and brightened) via Pixabay https://pixabay.com/photos/baking-soda-box-white-powder-768950/
"Lumber Timber Truck Logging" by MemoryCatcher [CC0] (cropped) via Pixabay https://pixabay.com/photos/lumber-timber-truck-logging-1713722/
"Cotton Fruit Open Country" by pianweizhuannong [CC0] (cropped) via Pixabay https://pixabay.com/photos/cotton-fruit-open-country-flower-1721144/
"Factory Building Smoke" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixababy https://pixabay.com/vectors/factory-building-smoke-industry-48781/
"Paper ream stack." by unknown [CC0] (no alterations) via PICRYL https://picryl.com/media/paper-ream-stack-affb0a
"Toothbrush Toothpaste Tube" by gustavorezende [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/toothbrush-toothpaste-tube-dental-3171553/

property
"Antimony (Mexico) 2" by James St. John [CC BY 2.0] (brightened) via Flickr https://www.flickr.com/photos/jsjgeology/17150760398
"Arsenic (Andreasberg, Harz Mountains, Germany) 1" by James St. John [CC BY 2.0] (contrast increased) via Flickr https://www.flickr.com/photos/jsjgeology/17508918772
"Feather Blue Falling" by Yuri_B [CC0] (rotated and background removed) via Pixabay https://pixabay.com/vectors/feather-blue-falling-plume-flight-1689331/
"Lifting Box Wood" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/lifting-box-wood-heavy-crate-24401/

proton
"Lithium Atom Isolated" by geralt [CC0] (cropped) via Pixabay https://pixabay.com/illustrations/lithium-atom-isolated-atomic-2784853/
"Scales Kitchen Weighing" by Clker-Free-Vector-Images [CC0] (dial rotated) via Pixabay https://pixabay.com/vectors/scales-kitchen-scales-weighing-35902/

radiant/solar energy
"Zelkova Serrata Tree Bonsai" by Deedster [CC0] (cropped and rotated) via Pixabay https://pixabay.com/en/zelkova-serrata-tree-bonsai-zelkova-1613784/
"Pond Water Outdoor" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/pond-water-outdoor-grass-outdoors-310149/
"Illustration depicting the overturning circulation of the global ocean." by NASA/JPL [Public Domain] (no alterations) via NASA Jet Propulsion Laboratory https://www.jpl.nasa.gov/news/news.php?release=2010-101
"Wind Energy Renewable" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/wind-energy-renewable-energy-wind-2029621/
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/hot-temperature-thermometer-weather-159386/

radiation
This image was created solely by Stephen Fleenor, PhD (Seidlitz Education)

radio wave
"Speaking in Phases" by NASA/JPL-Caltech [CC0] (cropped) via NASA https://www.jpl.nasa.gov/edu/teach/activity/speaking-in-phases/
"Saturn Planet Rings" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/saturn-planet-saturn-rings-148300/
"Computer Desktop Workstation Office Hardware" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/computer-desktop-workstation-office-158675/

reactant
"Baking Soda Box White" by evitaochel [CC0] (cropped and brightened) via Pixabay https://pixabay.com/photos/baking-soda-box-white-powder-768950/
"Vinegar Cleaning Cleaner" by evitochel [CC0] (cropped) via Pixabay https://pixabay.com/photos/vinegar-cleaning-cleaner-clean-768948/
"Baking Soda and Vinegar" by Stephen Fleenor (cropped)

reactivity/reactive
This image was created solely by Stephen Fleenor, PhD (Seidlitz Education)

relationship
"Bees Insects Blossom" by Buntysmum [CC0] (cropped) via Pixabay https://pixabay.com/photos/bees-insects-blossom-blackberry-4003580/
"Bricks Concrete Rock" by Pexels [CC0] (cropped) via Pixabay https://pixabay.com/photos/bricks-concrete-rock-stone-1839553/
"Brick Wall Brickwork White" MabelAmber [CC0] (cropped) via Pixabay https://pixabay.com/photos/brick-wall-wall-brickwork-3079574/
"Weather Icons Cloud" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/weather-icons-cloud-meteorology-160759/
"Medicine Pills Bottles" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/medicine-pills-bottles-medical-296966/
"Caterpillar Monarch Butterfly" by OpenClipart-Vectors [CC0] (rotated) via Pixabay https://pixabay.com/en/caterpillar-monarch-butterfly-156937/
"Cougar Mountain Lion" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/cougar-mountain-lion-wild-animal-47667/
"Bird" by yves_guillou (OCAL) [Public Domain] (no alterations) via Free Stock Photos http://www.freestockphotos.biz/stockphoto/15184
"Fever Sick Thermometer" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/fever-sick-thermometer-woman-bed-310721/

resource
"Drops of water liquid" by unknown [CC0] (cropped) via Pixabay https://pixabay.com/en/drops-of-water-water-liquid-fresh-578897/
"Húsafell Stone" by Pudpon [CC0 1.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:H%C3%BAsafell_Stone.png
"Barrel Container Oil" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/barrel-container-oil-metal-drum-36724/
"Pond Water Outdoor" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/pond-water-outdoor-grass-outdoors-310149/
"Association Community Group" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/association-community-group-meeting-152746/

revolve/revolution
"Earth Globe Planet" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/earth-globe-planet-world-147591/
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/

rift
This image was created solely by Stephen Fleenor, PhD (Seidlitz Education)

rotate/rotation
"Rotating earth (huge)" by The MP [CC BY 3.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Rotating_earth_(huge).gif
"Map Pin Illustrator" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/map-pin-illustrator-holder-place-42871/

runoff
This image was created solely by Stephen Fleenor, PhD (Seidlitz Education)

satellite
"Earth Globe Planet" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/earth-globe-planet-world-147591/
"Beach Sandy Paradise Palm" by Walkerssk [CC0] (cropped) via Pixabay https://pixabay.com/photos/beach-sandy-beach-paradise-1824855/
"Satellite Image Coast Coastline" by Free-Photos [CC0] (no alterations) via Pixabay https://pixabay.com/photos/satellite-image-coast-coastline-1030781/
"Satellite Soyuz Spaceship Space" by Alexas_Fotos [CC0] (no alterations) via Pixabay https://pixabay.com/photos/satellite-soyuz-spaceship-2771043/

seasons
"Earth Globe Planet" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/earth-globe-planet-world-147591/
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/
"Seasons Four Tree" by OpenClipart-Vectors [CC0] (rotated and cropped) via Pixabay https://pixabay.com/vectors/seasons-four-seasons-tree-nature-158601/

sediment
"Mountain Hill Rock" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/mountain-hill-rock-peak-barren-575618/
"Wind Energy Renewable" by OpenClipart-Vectors [CC0] (cropped and recolored) via Pixabay https://pixabay.com/vectors/wind-energy-renewable-energy-wind-2029621/
"Cloud Overcast Weather" by OpenClipat-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/cloud-overcast-weather-159388/
"Rain Cloud Nature" by Clker-Free-Vector-Images [CC0] (cropped) via Pixabay https://pixabay.com/vectors/rain-cloud-nature-weather-sky-310148/
"Satellite Soyuz Spaceship Space" by Alexas_Fotos [CC0] (no alterations) via Pixabay https://pixabay.com/photos/satellite-soyuz-spaceship-2771043/
"Sediment in the Gulf of Mexico" by Norman Kuring [Public Domain] (no alterations) via Wikimedia Commons https://en.wikipedia.org/wiki/File:Sediment_in_the_Gulf_of_Mexico.jpg

sequence
This image was created solely by Stephen Fleenor, PhD (Seidlitz Education)

short‐term environmental change
"Grass Meadow Green" by OpenClipart-Vectors [CC0] (recolored) via Pixabay https://pixabay.com/vectors/grass-meadow-green-agriculture-159804/
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (temperature changed) via Pixabay https://pixabay.com/vectors/hot-temperature-thermometer-weather-159386/
"Squirrel Animal" by harshal07 [CC0] (rotated) via Pixabay https://pixabay.com/vectors/squirrel-animal-pet-1456764/
"Lab Mouse Science" by mcmurryjulie [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/lab-mouse-mouse-science-lab-animal-1471870/
"Mouse Gray Small" by Clker-Free-Vector-Images [CC0] (rotated) via Pixabay https://pixabay.com/vectors/mouse-gray-small-animal-tail-48374/
"Fire Flames Hell" by Clker-Free-Vector-Images [CC0] (stretched and rotated) via Pixabay https://pixabay.com/vectors/fire-flames-hell-burn-bright-307336/

solstice
"Earth Globe Planet" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/earth-globe-planet-world-147591/
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/

solution
"Beaker Chemistry Empty" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/beaker-chemistry-empty-glasswares-159174/

species
"Amurtiger Tiger Big Cat" by Pixel-mixer [CC0] (cropped) via Pixabay https://pixabay.com/photos/amurtiger-tiger-big-cat-siberian-1975790/
"Puppy Labradoodle Pal" by slipschutz [CC0] (cropped) via Pixabay https://pixabay.com/photos/puppy-labradoodle-pal-friend-dog-5010561/
"Dog, Black Standard Poodle" by Karen Arnold [CC0 Public Domain] (cropped) via PublicDomainPictures https://www.publicdomainpictures.net/en/view-image.php?image=242148&picture=dog-black-standard-poodle
"Labrador Dog Outdoor" by stanze [CC0] (cropped) via Pixabay https://pixabay.com/photos/labrador-dog-outdoor-view-portrait-2121759/
"Cat Kitten Sit" by DarkWorkX [CC0] (cropped) via Pixabay https://pixabay.com/photos/cat-kitten-sit-isolated-red-white-2669554/

spectral class
This image was created solely by Stephen Fleenor, PhD (Seidlitz Education)

speed
"Stopwatch Racing Timer" by OpenClipart-Vectors [CC0] (second hand removed) via Pixabay https://pixabay.com/vectors/stopwatch-racing-timer-timing-153398/
"Automobile Car Red" by OpenClipart-Vectors [CC0] (transparency filter applied) via Pixabay https://pixabay.com/vectors/automobile-car-red-french-old-1300467/

spring tide
"Moon Planet Outer Space Solar" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/moon-planet-outer-space-26619/
"Earth Globe Planet" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/earth-globe-planet-world-147591/
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/

star
"Planet Sun" by ipicgr [CC0] (no alterations) via Pixabay https://pixabay.com/illustrations/planet-sun-star-1497205/
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/hot-temperature-thermometer-weather-159386/

star evolution
"Planet Sun" by ipicgr [CC0] (resized and brightened) via Pixabay https://pixabay.com/illustrations/planet-sun-star-1497205/
"Nursery of New Stars - GPN-2000-000972" by NASA [CC0] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Nursery_of_New_Stars_-_GPN-2000-000972.jpg
"Adult Age Baby" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/adult-age-baby-child-death-human-2028245/
Untitled by NASA Goddard Space Flight Center [CC0] (cropped) via NASA https://www.nasa.gov/feature/goddard/2019/nasa-s-tess-mission-spots-its-1st-star-shredding-black-hole

storm system
"Weather Icons Cloud" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/weather-icons-cloud-meteorology-160759/
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (temperature changed) via Pixabay https://pixabay.com/vectors/hot-temperature-thermometer-weather-159386/

subduction zone
"Lava Background Magma" by EriktheGreat [CC0] (cropped and brightened) via Pixabay https://pixabay.com/illustrations/lava-background-magma-nature-hot-499891/

subscript
"Baking Soda Box White" by evitaochel [CC0] (cropped and brightened) via Pixabay https://pixabay.com/photos/baking-soda-box-white-powder-768950/
"Vinegar Cleaning Cleaner" by evitochel [CC0] (cropped) via Pixabay https://pixabay.com/photos/vinegar-cleaning-cleaner-clean-768948/

substance
"Beaker Chemistry Full" by OpenClipart-Vectors [CC0] (recolored and cropped) via Pixabay https://pixabay.com/vectors/beaker-chemistry-full-glasswares-159176/
Untitled by unknown [CC0] (cropped and recolored) via Pxhere https://pxhere.com/en/photo/666730
"Explosions Pictogram Caution" by Clker-Free-Vector-Images [CC0] (cropped) via Pixabay https://pixabay.com/vectors/explosions-pictogram-caution-danger-28712/
"Fire Flame Flammable" by OpenIcons [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/flame-fire-flammable-inflammable-98645/

surface temperature
"Planet Sun" by ipicgr [CC0] (no alterations) via Pixabay https://pixabay.com/illustrations/planet-sun-star-1497205/
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/hot-temperature-thermometer-weather-159386/
"Rotating earth (huge)" by The MP [CC BY 3.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Rotating_earth_(huge).gif

tectonic plates
"World Map" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/world-map-world-map-earth-global-297315/

temperature range
"Globe World Map" by Clker-Free-Vector-Images [CC0] (recolored) via Pixabay https://pixabay.com/vectors/globe-world-map-earth-32299/
"Killer Whales Orcas Breaching" by 272447 [CC0] (cropped) via Pixabay https://pixabay.com/photos/killer-whales-orcas-breaching-1945411/
"Polar Bear Snow Predator" by kalhh [CC0] (cropped) via Pixabay https://pixabay.com/photos/polar-bear-snow-predator-cold-3629687/
"Cockroach Beetle Pest" by PublicDomainPictures [CC0] (cropped) via Pixabay https://pixabay.com/photos/cockroach-beetle-pest-insect-wing-70295/

thermal energy
"Fire Flames Hell" by Clker-Free-Vector-Images [CC0] (stretched and rotated) via Pixabay https://pixabay.com/vectors/fire-flames-hell-burn-bright-307336/
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (temperature changed) via Pixabay https://pixabay.com/vectors/hot-temperature-thermometer-weather-159386/

tilt
"Earth Globe Planet" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/earth-globe-planet-world-147591/

tolerance (ecological)
"Cloud Overcast Weather" by OpenClipat-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/cloud-overcast-weather-159388/
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/
"Rain Cloud Nature" by Clker-Free-Vector-Images [CC0] (cropped) via Pixabay https://pixabay.com/vectors/rain-cloud-nature-weather-sky-310148/
"Tropical Plant Green" by Jazella [CC0] (cropped, recolored, and rotated) via Pixabay https://pixabay.com/illustrations/tropical-plant-green-nature-leaves-3961593/

topographic map
"Africa Namibia Landscape" by kolibri5 [CC0] (cropped) via Pixabay https://pixabay.com/photos/africa-namibia-landscape-dry-heiss-1170055/

trait
"Dog Pet Hovawart" by Chiemsee2016 [CC0] (cropped) via Pixabay https://pixabay.com/photos/dog-pet-hovawart-black-1194087/
"Husky Dog Breed" by pixel2013 [CC0] (cropped) via Pixabay https://pixabay.com/photos/husky-dog-dog-breed-animal-3380548/
"Dog Animal Portrait" by Vizsalafotozas [CC0] (cropped) via Pixabay https://pixabay.com/photos/dog-animal-portrait-pet-brown-3277416/

transform boundary
"Lava Background Magma" by EriktheGreat [CC0] (cropped and brightened) via Pixabay https://pixabay.com/illustrations/lava-background-magma-nature-hot-499891/
"Transform fault-1" by Los688 [Public Domain] (cropped and recolored) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Transform_fault-1.svg

transition metal
This image was created solely by Stephen Fleenor, PhD (Seidlitz Education)

trench
Untitled by Jesse Allen [Public Domain] (cropped and rotated) via NASA https://earthobservatory.nasa.gov/images/77640/new-view-of-the-deepest-trench
"Satellite Soyuz Spaceship Space" by Alexas_Fotos [CC0] (no alterations) via Pixabay https://pixabay.com/photos/satellite-soyuz-spaceship-2771043/

unbalanced force
"Crate Box Wooden" by Clker-Free-Vector-Images [CC0] (elongated) via Pixabay https://pixabay.com/vectors/crate-box-wooden-container-package-310787/
"Push Pushing Move Moving" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/push-pushing-move-moving-action-150175/

valence electron
This image was created solely by Stephen Fleenor, PhD (Seidlitz Education)

valley
"Mountain Hill Rock" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/mountain-hill-rock-peak-barren-575618/
"Narrow Valley (4329975582)" by Afghanistan Matters [CC BY 2.0] (cropped) via Wikimedia commons https://commons.wikimedia.org/wiki/File:Narrow_Valley_(4329975582).jpg
"Watch for U-shaped valleys throughout the park" by Unknown [Public Domain] (cropped) via NPS https://www.nps.gov/glac/learn/nature/glacial-geology.htm

velocity
"Stopwatch Racing Timer" by OpenClipart-Vectors [CC0] (second hand removed) via Pixabay https://pixabay.com/vectors/stopwatch-racing-timer-timing-153398/
"Automobile Car Red" by OpenClipart-Vectors [CC0] (transparency filter applied) via Pixabay https://pixabay.com/vectors/automobile-car-red-french-old-1300467/

volcanic island arc
"Lava Background Magma" by EriktheGreat [CC0] (cropped and brightened) via Pixabay https://pixabay.com/illustrations/lava-background-magma-nature-hot-499891/
"Aleutian Trench" by Pcervelli [Public Domain] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Aleutian_Trench.jpg
"CIA Map of the Caribbean" by U.S. Central Intelligence Agency [Public Domain] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:CIA_map_of_the_Caribbean.png

warm front
"Map Pin Illustrator" by Clker-Free-Vector-Images [CC0] (recolored) via Pixabay https://pixabay.com/vectors/map-pin-illustrator-holder-place-42871/
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (temperature changed) via Pixabay https://pixabay.com/vectors/hot-temperature-thermometer-weather-159386/

wavelength
"The Ruler Setsquare Centimeter" by maciej326 [CC0] (cropped) via Pixabay https://pixabay.com/illustrations/the-ruler-setsquare-centimeter-1970660/

weather map
"Weather Icons Cloud" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/weather-icons-cloud-meteorology-160759/
"Blank US map borders" by Kaboom88 [Public Domain] (brightened) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Blank_US_map_borders.svg

yield
"Scuba Diving Tank Dive" by Clker-Free-Vector-Images [CC0] (darkened) via Pixabay https://pixabay.com/vectors/scuba-diving-tank-dive-cylinder-297321/
Untitled by unknown [CC0 Public Domain] (no alterations) via Pxhere https://pxhere.com/en/photo/704441
"Nuts & Bolts & Rust" by Orin Zebest [CC BY 2.0] (no alterations) via Flickr https://www.flickr.com/photos/33917831@N00/4374214237/

Biology

10% Energy Rule
"Caterpillar Monarch Butterfly" by OpenClipart-Vectors [CC0] (rotated) via Pixabay https://pixabay.com/en/caterpillar-monarch-butterfly-156937/
"Cougar Mountain Lion" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/cougar-mountain-lion-wild-animal-47667/
"Bird" by yves_guillou (OCAL) [Public Domain] (no alterations) via Free Stock Photos http://www.freestockphotos.biz/stockphoto/15184

abiotic
"Sunlight" by consuelo suarez [CC0] (cropped) via PublicDomainPictures https://www.publicdomainpictures.net/en/view-image.php?image=22515&picture=sunlight
"Drops of water liquid" by unknown [CC0] (cropped) via Pixabay https://pixabay.com/en/drops-of-water-water-liquid-fresh-578897/
"Soil" by Mesaytsegaye [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Soil.jpg
"Húsafell Stone" by Pudpon [CC0 1.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:H%C3%BAsafell_Stone.png

activation energy
This image was created solely by Stephen Fleenor, PhD (Seidlitz Education)

active transport
"0302 Phospholipid Bilayer labeled" by OpenStax [CC BY 3.0] (labels removed and cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:0302_Phospholipid_Bilayer_labeled.jpg
"Simple diagram of animal cell (blank)" by domdomegg [CC BY 4.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Simple_diagram_of_animal_cell_(blank).svg
"0303 Lipid Bilayer With Various Components labeled" by OpenStax [CC BY 3.0] (protein channels isolated and recolored) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:0303_Lipid_Bilayer_With_Various_Components_labeled.jpg

adapt/adaptation
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/
"Mouse Rodent Rat" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/mouse-rodent-rat-black-cute-296396/
"Gerbil Mouse Rodent" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/gerbil-mouse-rodent-brown-animal-303178/

aerobic cellular respiration
"Zelkova Serrata Tree Bonsai" by Deedster [CC0] (cropped, rotated and brightened) via Pixabay https://pixabay.com/en/zelkova-serrata-tree-bonsai-zelkova-1613784/
"Rg1024 Set of water drops" by rg1024 [CC0 1.0] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Rg1024_Set_of_water_drops.svg
"Rabbit Silhouette Black Isolated" by Gorkhs [CC0] (no alterations) via Pixabay https://pixabay.com/en/rabbit-silhouette-black-2262101/
"Animal mitochondrion diagram unlabeled" by LadyofHats [Public Domain] (glow added) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Animal_mitochondrion_diagram_unlabelled.svg
"Zelkova Serrata Tree Bonsai" by Deedster [CC0] (cropped, rotated and brightened) via Pixabay https://pixabay.com/en/zelkova-serrata-tree-bonsai-zelkova-1613784/

allele
"Reproduction Impregnation" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/reproduction-impregnation-150566/

amino acid
This image was created solely by Stephen Fleenor, PhD (Seidlitz Education)

anaerobic cellular respiration
"Zelkova Serrata Tree Bonsai" by Deedster [CC0] (cropped, rotated and brightened) via Pixabay https://pixabay.com/en/zelkova-serrata-tree-bonsai-zelkova-1613784/
"Rabbit Silhouette Black Isolated" by Gorkhs [CC0] (no alterations) via Pixabay https://pixabay.com/en/rabbit-silhouette-black-2262101/
"Animal mitochondrion diagram unlabeled" by LadyofHats [Public Domain] (glow added) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Animal_mitochondrion_diagram_unlabelled.svg
"Zelkova Serrata Tree Bonsai" by Deedster [CC0] (cropped, rotated and brightened) via Pixabay https://pixabay.com/en/zelkova-serrata-tree-bonsai-zelkova-1613784/

anatomical homology
"Human body silhouette" by Mikael Häggström [Public Domain] (recolored) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Human_body_silhouette.svg
"Dog Animal Hound" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/dog-animal-hound-mammal-silhouette-149300/
"Magpie Songbird Bird" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/magpie-songbird-bird-song-melody-147852/
"Blue Whale Animal" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/blue-whale-whale-animal-marine-sea-160806/
"Homology vertebrates-en" by Волков Владислав Петрович [CC BY-SA 4.0] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Homology_vertebrates-en.svg

ancestor
"Tapir Animal Baird’S Tapirus" by OpenClipart-Vectors [CC0] (rotated and recolored) via Pixabay https://pixabay.com/vectors/tapir-animal-baird-s-tapir-153797/
"Horseevolution" by Mcy jerry at English Wikipedia [CC BY-SA 3.0] (cropped, rotated and recolored) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Horseevolution.png
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/

animal cell
"Animal mitochondrion diagram unlabeled" by LadyofHats [Public Domain] (glow added) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Animal_mitochondrion_diagram_unlabelled.svg
"Organization levels mouse" by LadyofHats [CC0 1.0] (labels and cell removed) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Organization_levels_mouse.svg

Animalia
"Turtle Tortoise Sea" by kormandallas [CC0] (cropped) via Pixabay https://pixabay.com/photos/turtle-tortoise-sea-immersion-deep-2250720/
"Fungus Forest Mushroom" by HeyouRelax [CC0] (cropped) via Pixabay https://pixabay.com/photos/fungus-forest-mushroom-wild-2158028/
"leafy, background" by Leon Brooks [Public Domain] (cropped) via Pixnio https://pixnio.com/nature-landscapes/leaf-leaves/leafy-background
"Euglena Microorganisms Nutrition" by ep793 [CC0] (cropped) via Pixabay https://pixabay.com/illustrations/euglena-microorganisms-nutrition-2320760/
"Halobacteria" by NASA [Public Domain] (cropped) via Wikimedia Commons https://ca.m.wikipedia.org/wiki/Fitxer:Halobacteria.jpg
"Under a very high magnification of 20000X, this colorized scanning electron micrograph (SEM) revealed the presence of a single Gram-negative" by CDC/ Bette Jensen [Public Domain] (cropped) via Public Domain Files http://www.publicdomainfiles.com/show_file.php?id=13489041618725
"Insects Various Insect" by divotomezove [CC0] (cropped) via Pixabay https://pixabay.com/photos/insects-various-insect-bug-bugs-3700843/
"Snail Shell Slowly" by Momental [CC0] (no alterations) via Pixabay https://pixabay.com/photos/snail-shell-slowly-crawl-animal-2594139/
"Lemur Ring Tailed Primate" by skeeze [CC0] (cropped) via Pixabay https://pixabay.com/photos/lemur-ring-tailed-lemur-primate-1045220/
"Kingfisher Bird Blue" by timoschluter [CC0] (cropped) via Pixabay https://pixabay.com/photos/kingfisher-bird-blue-plumage-1905255/

antibiotic
"bacteria illness bacterium infection" by Unknown [CC0] (recolored) via SVG Silh https://svgsilh.com/image/156869.html
"Medicine Bottle Pills" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/medicine-bottle-pills-medication-297778/
"bacterium h bacterium" by Unknown [CC0] (recolored) via SVG Silh https://svgsilh.com/image/1455818.html
"Skull and crossbones" by Unknown [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Skull_and_crossbones.svg

anticodon
This image was created solely by Stephen Fleenor, PhD (Seidlitz Education)

aquatic
"Soil Earth Excavation" by OpenClipart-Vectors [CC0] (recolored and cropped) via Pixabay https://pixabay.com/vectors/soil-earth-excavation-exposed-575643/
"Lobster Crustaceans Red" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/lobster-crustaceans-red-living-37659/
"Fish Tuna Blue" by Clker-Free-Vector-Images [CC0] (rotated) via Pixabay https://pixabay.com/vectors/fish-tuna-blue-sea-food-seafood-30828/
"Trout Fish Rainbow" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/trout-fish-rainbow-trout-animal-294469/
"Seaweed Plant Algae" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/seaweed-plant-algae-aquatic-32720/
"Dolphin Blue Swimming" by Clker-Free-Vector-Images [CC0] (cropped) via Pixabay https://pixabay.com/vectors/dolphin-blue-swimming-tail-mammal-48409/
"Frog Green Amphibian" by Josethestoryteller [CC0] (no alterations) via Pixabay https://pixabay.com/illustrations/frog-green-amphibian-animal-nature-2457343/
"Protozoan Microbes Biology" by dbutlerdidit [CC0] (no alterations) via Pixabay https://pixabay.com/illustrations/protozoans-microbes-biology-science-1450090/

Archaea/archaebacteria
"Turtle Tortoise Sea" by kormandallas [CC0] (cropped) via Pixabay https://pixabay.com/photos/turtle-tortoise-sea-immersion-deep-2250720/
"Fungus Forest Mushroom" by HeyouRelax [CC0] (cropped) via Pixabay https://pixabay.com/photos/fungus-forest-mushroom-wild-2158028/
"leafy, background" by Leon Brooks [Public Domain] (cropped) via Pixnio https://pixnio.com/nature-landscapes/leaf-leaves/leafy-background
"Euglena Microorganisms Nutrition" by ep793 [CC0] (cropped) via Pixabay https://pixabay.com/illustrations/euglena-microorganisms-nutrition-2320760/
"Halobacteria" by NASA [Public Domain] (cropped) via Wikimedia Commons https://ca.m.wikipedia.org/wiki/Fitxer:Halobacteria.jpg
"Under a very high magnification of 20000X, this colorized scanning electron micrograph (SEM) revealed the presence of a single Gram-negative" by CDC/ Bette Jensen [Public Domain] (cropped) via Public Domain Files http://www.publicdomainfiles.com/show_file.php?id=13489041618725
"Champagne vent white smokers" by NOAA [Public Domain] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Champagne_vent_white_smokers.jpg
"Grand prismatic spring" by Jim Peaco, National Park Service [Public Domain] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Grand_prismatic_spring.jpg

artificial selection
"Puppy Bulldog Dog" by vlaaitje [CC0] (cropped) via Pixabay https://pixabay.com/photos/puppy-bulldog-dog-sweet-pet-1118584/
"Eurasians Medium Spitz-Like" by Couleur [CC0] (cropped) via Pixabay https://pixabay.com/photos/eurasians-medium-spitz-like-dog-2735337/
"Wolf Wild Animal World" by Alexas_Fotos [CC0] (cropped) via Pixabay https://pixabay.com/photos/wolf-wild-animal-animal-world-3151876/
"Mexican Wolf 2 yfb-edit 1" by Clark, Jim (U.S. Fish and Wildlife Service) [Public Domain] (cropped) via Wikimedia Commons https://en.wikipedia.org/wiki/File:Mexican_Wolf_2_yfb-edit_1.jpg
"Zoo Wolf Wild" by 35030 [CC0] (cropped) via Pixabay https://pixabay.com/photos/zoo-wolf-wild-mammal-animal-111178/
"German Shepherd Pet Portrait" by JeanineW [CC0] (cropped) VIA Pixabay https://pixabay.com/photos/german-shepherd-pet-portrait-dogs-3770786/
"Checkmark green" by Nobbler 76 [Public Domain] (no alterations) via Wikimedia Commons https://en.wikipedia.org/wiki/File:Checkmark_green.svg
"Stop Containing Street Sign" by 3dman_eu [CC0] (no alterations) via Pixabay https://pixabay.com/illustrations/stop-containing-street-sign-1013732/

asexual reproduction
"Turtle Tortoise Sea" by kormandallas [CC0] (cropped) via Pixabay https://pixabay.com/photos/turtle-tortoise-sea-immersion-deep-2250720/
"Fungus Forest Mushroom" by HeyouRelax [CC0] (cropped) via Pixabay https://pixabay.com/photos/fungus-forest-mushroom-wild-2158028/
"leafy, background" by Leon Brooks [Public Domain] (cropped) via Pixnio https://pixnio.com/nature-landscapes/leaf-leaves/leafy-background
"Euglena Microorganisms Nutrition" by ep793 [CC0] (cropped) via Pixabay https://pixabay.com/illustrations/euglena-microorganisms-nutrition-2320760/
"Halobacteria" by NASA [Public Domain] (cropped) via Wikimedia Commons https://ca.m.wikipedia.org/wiki/Fitxer:Halobacteria.jpg
"Under a very high magnification of 20000X, this colorized scanning electron micrograph (SEM) revealed the presence of a single Gram-negative" by CDC/ Bette Jensen [Public Domain] (cropped) via Public Domain Files http://www.publicdomainfiles.com/show_file.php?id=13489041618725

atmospheric nitrogen
"Stem Leaves Paris Parts Plant" by Unknown [CC0] (no alterations) via Max Pixel https://www.maxpixel.net/Stem-Leaves-Paris-Plants-Leaf-2082612
"Dicotyledoneae Asteraceae herb - root system, primary root becomes tap root and lateral roots" by RoRo [CC0 1.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Dicotyledoneae_Asteraceae_herb_-_root_system,_primary_root_becomes_tap_root_and_lateral_roots.JPG

atom
"Lithium Atom Isolated" by geralt [CC0] (no alterations) via Pixabay https://pixabay.com/illustrations/lithium-atom-isolated-atomic-2784853/

ATP
This image was created solely by Stephen Fleenor, PhD (Seidlitz Education)

autotroph
"Turtle Tortoise Sea" by kormandallas [CC0] (cropped) via Pixabay https://pixabay.com/photos/turtle-tortoise-sea-immersion-deep-2250720/
"Fungus Forest Mushroom" by HeyouRelax [CC0] (cropped) via Pixabay https://pixabay.com/photos/fungus-forest-mushroom-wild-2158028/
"leafy, background" by Leon Brooks [Public Domain] (cropped) via Pixnio https://pixnio.com/nature-landscapes/leaf-leaves/leafy-background
"Euglena Microorganisms Nutrition" by ep793 [CC0] (cropped) via Pixabay https://pixabay.com/illustrations/euglena-microorganisms-nutrition-2320760/
"Halobacteria" by NASA [Public Domain] (cropped) via Wikimedia Commons https://ca.m.wikipedia.org/wiki/Fitxer:Halobacteria.jpg
"Under a very high magnification of 20000X, this colorized scanning electron micrograph (SEM) revealed the presence of a single Gram-negative" by CDC/ Bette Jensen [Public Domain] (cropped) via Public Domain Files http://www.publicdomainfiles.com/show_file.php?id=13489041618725
"CSIRO ScienceImage 4203 A bluegreen algae species Cylindrospermum sp under magnification" by Willem van Aken, CSIRO [CC BY 3.0] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:CSIRO_ScienceImage_4203_A_bluegreen_algae_species_Cylindrospermum_sp_under_magnification.jpg

bacteria
"EscherichiaColi NIAID" by Rocky Mountain Laboratories, NIAID, NIH [Public Domain] (recolored) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:EscherichiaColi_NIAID.jpg
"DNA Infection Bacteria Bacterium Virus Cell" by Unknown [CC0] (recolored) via Max Pixel https://www.maxpixel.net/Dna-Infection-Bacteria-Bacterium-Virus-Cell-213708
"high, magnification, 10000x, strain, staphylococcus aureus, bacteria" by Janice Haney Carr, Matthew J. Arduino, DRPH, USCDCP [CC0] (cropped) via Pixnio https://pixnio.com/science/microscopy-images/staphylococcus-aureus/under-a-high-magnification-of-10000x-strain-of-staphylococcus-aureus-bacteria

bacteriophage
"Virus Bacteriophage Biology" by OpenClipart-Vectors [CC0] (brightened) via Pixabay https://pixabay.com/vectors/virus-bacteriophage-biology-disease-149183/

benign
"Human body silhouette" by Mikael Häggström [Public Domain] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Human_body_silhouette.svg
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/

biogeography
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/
"Nephrolepis" by Petr Kratochvil [CC0] (cropped and background removed) via PublicDomainPictures https://www.publicdomainpictures.net/en/view-image.php?image=10017&picture=nephrolepis
"Dinosaur Ancient Reptile" by Clker-Free-Vector-Images [CC0] (rotated) via Pixabay https://pixabay.com/vectors/dinosaur-ancient-reptile-46273/
"Snider-Pellegrini Wegener fossil map" by Osvaldocangaspadilla [Public Domain] (labels removed) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Snider-Pellegrini_Wegener_fossil_map.svg
"World Map Globe Geography" by Clker-Free-Vector-Images [CC0] (cropped and background removed) via Pixabay https://pixabay.com/vectors/world-map-globe-geography-earth-47959/

biomass
"Rabbit Silhouette Black Isolated" by Gorkhs [CC0] (no alterations) via Pixabay https://pixabay.com/en/rabbit-silhouette-black-2262101/
"Zelkova Serrata Tree Bonsai" by Deedster [CC0] (cropped and rotated) via Pixabay https://pixabay.com/en/zelkova-serrata-tree-bonsai-zelkova-1613784/
"Forest Trees Evergreen" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/forest-trees-evergreen-conifers-310072/
"Beaver Animal Rodent" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/beaver-animal-rodent-standing-tail-48437/
"Moose Large Body" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/moose-large-body-animal-mammal-48465/
"Dandelion Flower Yellow" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/dandelion-flower-yellow-plant-weed-31406/
"Bird Silhouette Flying" by Elionas [CC0] (no alterations) via Pixabay https://pixabay.com/en/bird-silhouette-flying-movement-1314469/
"Caterpillar Monarch Butterfly" by OpenClipart-Vectors [CC0] (rotated) via Pixabay https://pixabay.com/en/caterpillar-monarch-butterfly-156937/
"Cougar Mountain Lion" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/cougar-mountain-lion-wild-animal-47667/
"Bird" by yves_guillou (OCAL) [Public Domain] (no alterations) via Free Stock Photos http://www.freestockphotos.biz/stockphoto/15184
"Scales Kitchen Weighing" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/scales-kitchen-scales-weighing-35902/

biomolecule/macromolecule
"DNA mutation" by Mouagip [Public Domain] (recolored, cropped and labels removed) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:DNA_UV_mutation.svg
"Diagram human cell nucleus no text" by Mariana Ruiz Villareal LadyofHats and Peter Znamenskiy [Public Domain] (recolored) via Wikimedia Commons https://en.wikipedia.org/wiki/File:Diagram_human_cell_nucleus_no_text.png

biotic
"Development Germinating" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/en/development-germinating-germination-1300176/
"Elephant Animal Trunk" by Clker-Free-Vector-Images [CC0] (cropped) via Pixabay https://pixabay.com/en/elephant-animal-trunk-tusks-large-48423/
"Bones Bleached White" by holmespj [CC0] (cropped) via Pixabay https://pixabay.com/photos/bones-bleached-white-death-drought-3670740/
"Ink Red Splatter" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/ink-red-splatter-abstract-paint-303244/

cancer/tumor
"Human body silhouette" by Mikael Häggström [Public Domain] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Human_body_silhouette.svg

capsid
"Virus Bacteriophage Biology" by OpenClipart-Vectors [CC0] (brightened) via Pixabay https://pixabay.com/vectors/virus-bacteriophage-biology-disease-149183/
"DNA mutation" by Mouagip [Public Domain] (recolored, cropped and labels removed) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:DNA_UV_mutation.svg
"TMV structure simple" by Thomas Splettstoesser [CC BY-SA 3.0] (labels removed) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:TMV_structure_simple.png

carbohydrate
"Human body silhouette" by Mikael Häggström [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Human_body_silhouette.svg
"Green Grasshopper Insect" by Nika_Akin [CC0] (rotated) via Pixabay https://pixabay.com/illustrations/green-grasshopper-insect-painting-4707705/
"Russet potato cultivar with sprouts" by ZooFari [Public Domain] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Russet_potato_cultivar_with_sprouts.jpg
"Lump Sugar Cubes" by Humusak [CC0] (no alterations) via Pixabay https://pixabay.com/photos/lump-sugar-sugar-cubes-white-sweet-549096/

carbon
"Zelkova Serrata Tree Bonsai" by Deedster [CC0] (cropped and rotated) via Pixabay https://pixabay.com/en/zelkova-serrata-tree-bonsai-zelkova-1613784/
"Soil Layer Exposed" by OpenClipart-Vectors [CC0] (cropped and recolored) via Pixabay https://pixabay.com/vectors/soil-layer-exposed-cover-grass-575641/
"Deer Silhouette Clipart" by Karen Arnold [CC0] (no alterations) via PublicDomainPictures https://www.publicdomainpictures.net/en/view-image.php?image=77626&picture=deer-silhouette-clipart
"L-asparagine-3D-balls" by Jynto and Ben Mills [Public Domain] (transparency added) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:L-asparagine-3D-balls.png

carbon cycle
"Deer Silhouette Clipart" by Karen Arnold [CC0] (no alterations) via PublicDomainPictures https://www.publicdomainpictures.net/en/view-image.php?image=77626&picture=deer-silhouette-clipart
"Carbon cycle-simple diagram" by FischX [Public Domain] (labels removed) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Carbon_cycle-simple_diagram.svg
"Zelkova Serrata Tree Bonsai" by Deedster [CC0] (cropped and rotated) via Pixabay https://pixabay.com/en/zelkova-serrata-tree-bonsai-zelkova-1613784/

carbon dioxide
"Rabbit Silhouette Black Isolated" by Gorkhs [CC0] (no alterations) via Pixabay https://pixabay.com/en/rabbit-silhouette-black-2262101/
"Zelkova Serrata Tree Bonsai" by Deedster [CC0] (cropped and rotated) via Pixabay https://pixabay.com/en/zelkova-serrata-tree-bonsai-zelkova-1613784/
"Air Pollution Factory Industry" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/air-pollution-factory-industry-149241/

carbon fixation
"Stem Leaves Paris Parts Plant" by Unknown [CC0] (no alterations) via Max Pixel https://www.maxpixel.net/Stem-Leaves-Paris-Plants-Leaf-2082612

carnivore
"Cougar Mountain Lion" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/cougar-mountain-lion-wild-animal-47667/
"Rabbit Silhouette Black Isolated" by Gorkhs [CC0] (no alterations) via Pixabay https://pixabay.com/en/rabbit-silhouette-black-2262101/
"Checkmark green" by Nobbler 76 [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Checkmark_green.svg

catalyst
This image was created solely by Stephen Fleenor, PhD (Seidlitz Education)

cell
This image was created solely by Stephen Fleenor, PhD (Seidlitz Education)

cell cycle
This image was created solely by Stephen Fleenor, PhD (Seidlitz Education)

cell differentiation
"DNA mutation" by Mouagip [Public Domain] (recolored, cropped and labels removed) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:DNA_UV_mutation.svg
"Neuron Nerve Cell Axon" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/neuron-nerve-cell-axon-dendrite-296581/

cell membrane
"0303 Lipid Bilayer With Various Components labeled" by OpenStax [CC BY 3.0] (cropped and labels removed) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:0303_Lipid_Bilayer_With_Various_Components_labeled.jpg

cell wall
"0303 Lipid Bilayer With Various Components labeled" by OpenStax [CC BY 3.0] (cropped and labels removed) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:0303_Lipid_Bilayer_With_Various_Components_labeled.jpg
"Mushroom Cartoon Fungus" by basker_Dhandapani [CC0] (no alterations) via Pixabay https://pixabay.com/illustrations/mushroom-cartoon-fungus-vegetable-2844146/
"Zelkova Serrata Tree Bonsai" by Deedster [CC0] (cropped and rotated) via Pixabay https://pixabay.com/en/zelkova-serrata-tree-bonsai-zelkova-1613784/
"Human body silhouette" by Mikael Häggström [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Human_body_silhouette.svg

centriole
"Figure 04 03 08" by CNX OpenStax [CC BY 4.0] (labels removed and cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Figure_04_03_08.jpg

characteristic
This image was created solely by Stephen Fleenor, PhD (Seidlitz Education)

chloroplast
"Rg1024 Set of water drops" by rg1024 [CC0 1.0] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Rg1024_Set_of_water_drops.svg
"Chloroplast Chlorophyll Unlabelled" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/chloroplast-chlorophyll-unlabelled-35023/

chromatid
This image was created solely by Stephen Fleenor, PhD (Seidlitz Education)

chromosomal mutation
This image was created solely by Stephen Fleenor, PhD (Seidlitz Education)

chromosome
"DNA mutation" by Mouagip [Public Domain] (recolored, cropped and labels removed) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:DNA_UV_mutation.svg

circulatory system
"Truck Delivery Box Vehicle Car Transport Shipping" by Unknown [CC0] (cropped and recolored) via Max Pixel https://www.maxpixel.net/Truck-Delivery-Box-Vehicle-Car-Transport-Shipping-2181037
"Circulatory System no tags" by LadyofHats [Public Domain] (no alterations) via Wikimedia Commons https://zh-yue.wikipedia.org/wiki/File:Circulatory_System_no_tags.svg

cladogram
"Chickadee Bird Animal" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/chickadee-bird-animal-wildlife-48019/
"Eel Fish Aquaculture" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/eel-fish-aquaculture-seafood-32679/
"Fish Scale Species" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/fish-scales-species-fins-water-48134/
"Gecko Tail Reptile" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/gecko-tail-reptile-crawling-lizard-48332/
"Frog Sitting Amphibian" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/frog-sitting-amphibian-wildlife-48498/
"Bear Grizzly Black" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/bear-grizzly-black-animal-mammal-38067/

classify/classification
This image was created solely by Stephen Fleenor, PhD (Seidlitz Education)

climax community
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/
"Grass Meadow Green" by OpenClipart-Vectors [CC0] (recolored) via Pixabay https://pixabay.com/vectors/grass-meadow-green-agriculture-159804/
"Lichen Stone Rock" by aitoff [CC0] (cropped) via Pixabay https://pixabay.com/photos/lichen-stone-rock-old-patina-620136/
"Húsafell Stone" by Pudpon [CC0 1.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:H%C3%BAsafell_Stone.png

codominance
"Cow Dairy Animal" by Clker-Free-Vector-Images [CC0] (cropped and recolored) via Pixabay https://pixabay.com/vectors/cow-dairy-animal-mammal-barn-farm-48315/
"Reproduction Impregnation" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/reproduction-impregnation-150566/

codon
This image was created solely by Stephen Fleenor, PhD (Seidlitz Education)

commensalism
"Smiley Face Smile" by PixLoger [CC0] (no alterations) via Pixabay https://pixabay.com/en/smiley-face-smile-good-nice-3189739/
"Smiley Face Average" by PixLoger [CC0] (no alterations) via Pixabay https://pixabay.com/en/smiley-face-average-okay-3189736/
"Remora and shark" by Brian Snelson [CC BY 2.0] (no alterations) via Flickr https://www.flickr.com/photos/exfordy/2950573720

community
"Rabbit Silhouette Black Isolated" by Gorkhs [CC0] (recolored) via Pixabay https://pixabay.com/en/rabbit-silhouette-black-2262101/
"Moose Large Body" by Clker-Free-Vector-Images [CC0] (recolored) via Pixabay https://pixabay.com/en/moose-large-body-animal-mammal-48465/
"Caterpillar Monarch Butterfly" by OpenClipart-Vectors [CC0] (recolored) via Pixabay https://pixabay.com/en/caterpillar-monarch-butterfly-156937/

compete/competition
"Fighting Nyalas" by Papphase [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Fighting_Nyalas.JPG
"Hyenas Fight Against Lions Over a Kill HD 12" by Kruger Sightings HD [CC BY 3.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Hyenas_Fight_Against_Lions_Over_a_Kill_HD_12.png
"Steenbock Kruger Deer" by WiseTraveller [CC0] (edges softened) via Pixabay https://pixabay.com/photos/steenbok-kruger-deer-antelope-1364425/

concentration gradient
This image was created solely by Stephen Fleenor, PhD (Seidlitz Education)

consumer
"Marine food web" by Siyavula Education [CC BY 2.0] (no alterations) via Flickr https://www.flickr.com/photos/121935927@N06/13578843423

crossing over
This image was created solely by Stephen Fleenor, PhD (Seidlitz Education)

cuticle
"Stem Leaves Paris Parts Plant" by Unknown [CC0] (no alterations) via Max Pixel https://www.maxpixel.net/Stem-Leaves-Paris-Plants-Leaf-2082612
"Rg1024 Set of water drops" by rg1024 [CC0 1.0] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Rg1024_Set_of_water_drops.svg
"Caterpillar Monarch Butterfly" by OpenClipart-Vectors [CC0] (rotated) via Pixabay https://pixabay.com/en/caterpillar-monarch-butterfly-156937/

cytoplasm
"Animal mitochondrion diagram unlabeled" by LadyofHats [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Animal_mitochondrion_diagram_unlabelled.svg
"Rg1024 Set of water drops" by rg1024 [CC0 1.0] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Rg1024_Set_of_water_drops.svg

daughter cell
This image was created solely by Stephen Fleenor, PhD (Seidlitz Education)

decomposer/detritivore
"bacterium h bacterium" by Unknown [CC0] (no alterations) via SVG Silh https://svgsilh.com/image/1455818.html
"bacteria illness bacterium infection" by Unknown [CC0] (no alterations) via SVG Silh https://svgsilh.com/image/156869.html
"Branch Leaf Tree" by Clker-Free-Vector-Images [CC0] (rotated) via Pixabay https://pixabay.com/vectors/branch-leaf-tree-dead-fall-plant-37778/
"Dead mouse" by Madprime [CC0 1.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Dead_mouse.svg
"Mushroom Cartoon Fungus" by basker_Dhandapani [CC0] (no alterations) via Pixabay https://pixabay.com/illustrations/mushroom-cartoon-fungus-vegetable-2844146/
"Tree Art Artwork" by OpenClipart-Vectorts [CC0] (rotated) via Pixabay https://pixabay.com/vectors/tree-art-artwork-trunk-cartoon-576866/
"Biodiversity Earthworm Fertilizer" by OpenClipart-Vectors [CC0] (rotated) via Pixabay https://pixabay.com/vectors/biodiversity-earthworm-fertilizer-160380/

defense
"Human body silhouette" by Mikael Häggström [Public Domain] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Human_body_silhouette.svg
"bacteria illness bacterium infection" by Unknown [CC0] (recolored) via SVG Silh https://svgsilh.com/image/156869.html
"bacteria illness bacterium infection" by Unknown [CC0] (recolored) via SVG Silh https://svgsilh.com/image/156867.html
"bacterium h bacterium" by Unknown [CC0] (recolored) via SVG Silh https://svgsilh.com/image/1455818.html
"Bricks Wall" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/en/bricks-wall-red-161235/
"Cougar Mountain Lion" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/cougar-mountain-lion-wild-animal-47667/

dehydration synthesis
"Rg1024 Set of water drops" by rg1024 [CC0 1.0] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Rg1024_Set_of_water_drops.svg

deoxyribose sugar
"DNA mutation" by Mouagip [Public Domain] (recolored, cropped and labels removed) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:DNA_UV_mutation.svg

descend/descendant
"Homo habilis-2" by W. Schnaubelt & N. Kieser (Atelier WILD LIFE ART) [CC BY-SA 2.5] (no alterations) via Wikimedia Commons https://en.wikipedia.org/wiki/File:Homo_habilis-2.JPG
"Homo erectus new" by W. Schnaubelt & N. Kieser (Atelier WILD LIFE ART) [CC BY-SA 2.5] (no alterations) via Wikimedia Commons https://en.wikipedia.org/wiki/File:Homo_erectus_new.JPG
"Homo heidelbergensis - forensic facial reconstruction-crop" by Cicero Moraes [CC BY-SA 3.0] (no alterations) via Wikimedia Commons https://en.wikipedia.org/wiki/File:Homo_heidelbergensis_-_forensic_facial_reconstruction-crop.png
Untitled by U.S. Army [Public Domain] (cropped) via U.S. Army https://www.army.mil/article/45790/picatinny_engineer_earns_dod_recognition_for_service_to_nj_hispanic_community
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/

developmental homology
"Baer embryos" by Romanes, G. J. after Haeckel, E. [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Baer_embryos.png

dichotomous key/identification key
"Insects Various Insect" by divotomezove [CC0] (cropped and rotated) via Pixabay https://pixabay.com/photos/insects-various-insect-bug-bugs-3700843/

diffusion
This image was created solely by Stephen Fleenor, PhD (Seidlitz Education)

digestive system
"Digestive system without labels" by LadyOfHats [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Digestive_system_without_labels.svg
"Apple Slice Fruit" by Clker-Free-Vector-Images [CC0] (rotated) via Pixabay https://pixabay.com/en/apple-slice-fruit-food-juicy-ripe-31768/

dihybrid cross
"Male Toilet Public" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/male-toilet-public-bathroom-44078/
"Female Girl Symbol" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/female-girl-symbol-toilet-bathroom-297734/
"Baby Babyhood Childhood" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/baby-babyhood-childhood-cradle-2023174/
"Reproduction Impregnation" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/reproduction-impregnation-150566/

diploid
"Human chromosomesXXY01" by Nami-ja [Public Domain] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Human_chromosomesXXY01.png
"Socks" by unknown [CC0 Public Domain] (cropped) via PublicDomainPictures https://www.publicdomainpictures.net/en/view-image.php?image=241249&picture=socks
"Pair of Blue Socks Hanging" by Suzanne Jutzeler [CC0] (cropped) via Pexels https://www.pexels.com/photo/pair-of-blue-socks-hanging-1287513/
"Ankle Socks Children Knitted" by congerdesign [CC0] (cropped) via Pixabay https://pixabay.com/photos/ankle-socks-children-socks-knitted-1578652/
"Step 1" by bark [CC BY 2.0] (no alterations) via Flickr https://www.flickr.com/photos/barkbud/4371216605

diversity/diverse
"Maize Field Corn" by GraphicsSC [CC0] (brightened) via Pixabay https://pixabay.com/photos/maize-field-corn-field-1001106/
"Corn Market Hazelnut" by GregReese [CC0] (no alterations) via Pixabay https://pixabay.com/photos/corn-market-hazelnut-agriculture-3229230/
"Caterpillar Monarch Butterfly" by OpenClipart-Vectors [CC0] (rotated) via Pixabay https://pixabay.com/en/caterpillar-monarch-butterfly-156937/
"tail seabird nature wildlife" by unknown [CC0] (no alterations) via SVG Silh https://svgsilh.com/image/24432.html
"Bird Silhouette Flying" by Elionas [CC0] (no alterations) via Pixabay https://pixabay.com/en/bird-silhouette-flying-movement-1314469/
"Beaver Animal Rodent" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/beaver-animal-rodent-standing-tail-48437/
"Moose Large Body" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/moose-large-body-animal-mammal-48465/
"Dandelion Flower Yellow" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/dandelion-flower-yellow-plant-weed-31406/
"Beedle Insect Bug" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/beetle-insect-bug-blue-black-legs-34372/
"Cougar Mountain Lion" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/cougar-mountain-lion-wild-animal-47667/
"Forest Trees Oak" by Clker-Free-Vector-Images [CC0] (recolored and cropped) via Pixabay https://pixabay.com/vectors/forest-trees-oak-fir-pine-spruce-31910/
"Rabbit Silhouette Black Isolated" by Gorkhs [CC0] (no alterations) via Pixabay https://pixabay.com/en/rabbit-silhouette-black-2262101/

DNA (deoxyribonucleic acid)
"Icons Information Rodentia" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/icons-information-rodentia-icons-1294597/
"Genetics Chromosome Rna" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/genetics-chromosomes-rna-dna-156404/

DNA replication
This image was created solely by Stephen Fleenor, PhD (Seidlitz Education)

DNA virus
"Virus Bacteriophage Biology" by OpenClipart-Vectors [CC0] (brightened) via Pixabay https://pixabay.com/vectors/virus-bacteriophage-biology-disease-149183/
"DNA mutation" by Mouagip [Public Domain] (recolored, cropped and labels removed) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:DNA_UV_mutation.svg

dominant
"Brown Eye Eyelash" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/brown-eye-eyelash-optic-optical-2027395/
"Blue Eye Eyelash" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/blue-eye-eyelash-optic-optical-2027392/

double helix
"Analysis Biology Cell" by OpenClipart-Vectors [CC0] (figure and cells removed) via Pixabay https://pixabay.com/vectors/analysis-biology-cell-cell-culture-2025834/
"Genetics Chromosome Rna" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/genetics-chromosomes-rna-dna-156404/
"Image3-3 Allan Warren" by Allan warren [CC BY-SA 3.0] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Image3-3_Allan_Warren.JPG

dynamic equilibrium
"Rabbit Silhouette Black Isolated" by Gorkhs [CC0] (recolored) via Pixabay https://pixabay.com/en/rabbit-silhouette-black-2262101/
"Cougar Mountain Lion" by Clker-Free-Vector-Images [CC0] (recolored) via Pixabay https://pixabay.com/en/cougar-mountain-lion-wild-animal-47667/

ecological succession
"Soil Earth Excavation" by OpenClipart-Vectors [CC0] (recolored and cropped) via Pixabay https://pixabay.com/vectors/soil-earth-excavation-exposed-575643/
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/
"Grass Meadow Green" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/grass-meadow-green-agriculture-159804/

ecosystem
"Rabbit Silhouette Black Isolated" by Gorkhs [CC0] (recolored) via Pixabay https://pixabay.com/en/rabbit-silhouette-black-2262101/
"Moose Large Body" by Clker-Free-Vector-Images [CC0] (recolored) via Pixabay https://pixabay.com/en/moose-large-body-animal-mammal-48465/
"Caterpillar Monarch Butterfly" by OpenClipart-Vectors [CC0] (recolored) via Pixabay https://pixabay.com/en/caterpillar-monarch-butterfly-156937/
"Pond Water Outdoor" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/pond-water-outdoor-grass-outdoors-310149/

endocrine system
"Human body silhouette" by Mikael Häggström [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Human_body_silhouette.svg
"Airmail Envelope Back View" by Karen Arnold [CC0] (rotated) via PublicDomainPictures https://www.publicdomainpictures.net/en/view-image.php?image=42544&picture=airmail-envelope-back-view

endoplasmic reticulum (ER)
"0313 Endoplasmic Reticulum a labeled" by OpenStax [CC BY 3.0] (labels removed) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:0313_Endoplasmic_Reticulum_a_labeled.png

energy conversion/transformation
"Beaker Experiment Bubbles" by OpenClipart-Vectors [CC0] (recolored) via Pixabay https://pixabay.com/vectors/beaker-experiment-bubbles-chemistry-148167/
"Light Bulb Lightbulb" by Clker-Free-Vector-Images [CC0] (rotated) via Pixabay https://pixabay.com/vectors/light-bulb-lightbulb-light-bulb-34547/
"Battery Energy Power" by OpenClipart-Vectors [CC0] (rotated) via Pixabay https://pixabay.com/vectors/battery-energy-power-cell-156718/
"Carrot Orange" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/carrot-orange-carrot-vegetables-1299147/
"Silhouette Running Run" by mohammed_hassan [CC0] (rotated) via Pixabay https://pixabay.com/vectors/silhouette-running-run-fast-3199472/

energy pyramid
"bacterium h bacterium" by Unknown [CC0] (no alterations) via SVG Silh https://svgsilh.com/image/1455818.html
"bacteria illness bacterium infection" by Unknown [CC0] (no alterations) via SVG Silh https://svgsilh.com/image/156869.html
"Mushroom Cartoon Fungus" by basker_Dhandapani [CC0] (no alterations) via Pixabay https://pixabay.com/illustrations/mushroom-cartoon-fungus-vegetable-2844146/
"Biodiversity Earthworm Fertilizer" by OpenClipart-Vectors [CC0] (rotated) via Pixabay https://pixabay.com/vectors/biodiversity-earthworm-fertilizer-160380/
"Caterpillar Monarch Butterfly" by OpenClipart-Vectors [CC0] (rotated) via Pixabay https://pixabay.com/en/caterpillar-monarch-butterfly-156937/
"Cougar Mountain Lion" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/cougar-mountain-lion-wild-animal-47667/
"Bird" by yves_guillou (OCAL) [Public Domain] (no alterations) via Free Stock Photos http://www.freestockphotos.biz/stockphoto/15184
"Zelkova Serrata Tree Bonsai" by Deedster [CC0] (cropped and rotated) via Pixabay https://pixabay.com/en/zelkova-serrata-tree-bonsai-zelkova-1613784/
"Dandelion Flower Yellow" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/dandelion-flower-yellow-plant-weed-31406/
"Animal Bear Brown" by OpenClipart-Vectors [CC0] (rotated) via Pixabay https://pixabay.com/vectors/animal-bear-brown-cub-cute-hairy-160462/
"Rabbit Silhouette Black Isolated" by Gorkhs [CC0] (no alterations) via Pixabay https://pixabay.com/en/rabbit-silhouette-black-2262101/

environment
"Rabbit Silhouette Black Isolated" by Gorkhs [CC0] (recolored) via Pixabay https://pixabay.com/en/rabbit-silhouette-black-2262101/
"Moose Large Body" by Clker-Free-Vector-Images [CC0] (recolored) via Pixabay https://pixabay.com/en/moose-large-body-animal-mammal-48465/
"Caterpillar Monarch Butterfly" by OpenClipart-Vectors [CC0] (recolored) via Pixabay https://pixabay.com/en/caterpillar-monarch-butterfly-156937/
"Pond Water Outdoor" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/pond-water-outdoor-grass-outdoors-310149/
"Human body silhouette" by Mikael Häggström [Public Domain] (recolored) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Human_body_silhouette.svg

environmental factor
"Skull and crossbones" by Unknown [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Skull_and_crossbones.svg

enzyme
This image was created solely by Stephen Fleenor, PhD (Seidlitz Education)

enzyme inhibitor
"Delete No Access Denied Road" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/delete-no-access-denied-road-sign-146891/

Eubacteria
"Turtle Tortoise Sea" by kormandallas [CC0] (cropped) via Pixabay https://pixabay.com/photos/turtle-tortoise-sea-immersion-deep-2250720/
"Fungus Forest Mushroom" by HeyouRelax [CC0] (cropped) via Pixabay https://pixabay.com/photos/fungus-forest-mushroom-wild-2158028/
"leafy, background" by Leon Brooks [Public Domain] (cropped) via Pixnio https://pixnio.com/nature-landscapes/leaf-leaves/leafy-background
"Euglena Microorganisms Nutrition" by ep793 [CC0] (cropped) via Pixabay https://pixabay.com/illustrations/euglena-microorganisms-nutrition-2320760/
"Halobacteria" by NASA [Public Domain] (cropped) via Wikimedia Commons https://ca.m.wikipedia.org/wiki/Fitxer:Halobacteria.jpg
"Under a very high magnification of 20000X, this colorized scanning electron micrograph (SEM) revealed the presence of a single Gram-negative" by CDC/ Bette Jensen [Public Domain] (cropped) via Public Domain Files http://www.publicdomainfiles.com/show_file.php?id=13489041618725
"Soil Earth Excavation" by OpenClipart-Vectors [CC0] (recolored and cropped) via Pixabay https://pixabay.com/vectors/soil-earth-excavation-exposed-575643/
"Human body silhouette" by Mikael Häggström [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Human_body_silhouette.svg

eukaryote
"Turtle Tortoise Sea" by kormandallas [CC0] (cropped) via Pixabay https://pixabay.com/photos/turtle-tortoise-sea-immersion-deep-2250720/
"Fungus Forest Mushroom" by HeyouRelax [CC0] (cropped) via Pixabay https://pixabay.com/photos/fungus-forest-mushroom-wild-2158028/
"leafy, background" by Leon Brooks [Public Domain] (cropped) via Pixnio https://pixnio.com/nature-landscapes/leaf-leaves/leafy-background
"Euglena Microorganisms Nutrition" by ep793 [CC0] (cropped) via Pixabay https://pixabay.com/illustrations/euglena-microorganisms-nutrition-2320760/
"Halobacteria" by NASA [Public Domain] (cropped) via Wikimedia Commons https://ca.m.wikipedia.org/wiki/Fitxer:Halobacteria.jpg
"Under a very high magnification of 20000X, this colorized scanning electron micrograph (SEM) revealed the presence of a single Gram-negative" by CDC/ Bette Jensen [Public Domain] (cropped) via Public Domain Files http://www.publicdomainfiles.com/show_file.php?id=13489041618725
"Koli Bacteria Escherichia Coli" by geralt [CC0] (no alterations) via Pixabay https://pixabay.com/photos/koli-bacteria-escherichia-coli-123081/

evolution
This image was created solely by Stephen Fleenor, PhD (Seidlitz Education)

excretory system
"Human body silhouette" by Mikael Häggström [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Human_body_silhouette.svg
Untitled by Painter06 [CC0] (rotated) via Pixabay https://pixabay.com/en/trash-waste-recycling-recyclable-3323974/
"Urinary system" by Mikael Häggström [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Urinary_system.gif

fatty acid
"Walrus animal male detailed photo white background" by Hickey Bill, U.S. Fish and Wildlife Service [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Walrus_animal_male_detailed_photo_white_background.jpg
"White Grubs Larvae Beetle" by zimt2003 [CC0] (no alterations) via Pixabay https://pixabay.com/photos/white-grubs-larvae-beetle-larvae-4395545/
"Sunflower Seeds Cores Nuts" by Lebensmittelfotos [CC0] (no alterations) via Pixabay https://pixabay.com/photos/sunflower-seeds-cores-nuts-snack-1139/

feedback loop/mechanism
This image was created solely by Stephen Fleenor, PhD (Seidlitz Education)

flow of energy
"Caterpillar Monarch Butterfly" by OpenClipart-Vectors [CC0] (rotated) via Pixabay https://pixabay.com/en/caterpillar-monarch-butterfly-156937/
"Cougar Mountain Lion" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/cougar-mountain-lion-wild-animal-47667/
"Bird" by yves_guillou (OCAL) [Public Domain] (no alterations) via Free Stock Photos http://www.freestockphotos.biz/stockphoto/15184

flow of matter
"Caterpillar Monarch Butterfly" by OpenClipart-Vectors [CC0] (rotated) via Pixabay https://pixabay.com/en/caterpillar-monarch-butterfly-156937/
"Cougar Mountain Lion" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/cougar-mountain-lion-wild-animal-47667/
"Bird" by yves_guillou (OCAL) [Public Domain] (no alterations) via Free Stock Photos http://www.freestockphotos.biz/stockphoto/15184

food chain
"Caterpillar Monarch Butterfly" by OpenClipart-Vectors [CC0] (rotated) via Pixabay https://pixabay.com/en/caterpillar-monarch-butterfly-156937/
"Cougar Mountain Lion" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/cougar-mountain-lion-wild-animal-47667/
"Bird" by yves_guillou (OCAL) [Public Domain] (no alterations) via Free Stock Photos http://www.freestockphotos.biz/stockphoto/15184

food web
"Marine food web" by Siyavula Education [CC BY 2.0] (no alterations) via Flickr https://www.flickr.com/photos/121935927@N06/13578843423

fossil
"Soil Earth Excavation" by OpenClipart-Vectors [CC0] (recolored and cropped) via Pixabay https://pixabay.com/vectors/soil-earth-excavation-exposed-575643/
"Lizard Gecko Dragon" by Clker-Free-Vector-Images [CC0] (cropped and rotated) via Pixabay https://pixabay.com/vectors/lizard-gecko-dragon-animal-cartoon-23157/
"Dinosaur Lizard Fossil" by Petr Kratochvil [CC0] (cropped and rotated) via Needpix https://www.needpix.com/photo/1384234/dinosaur-lizard-fossil-old-ancient-stone-nature-rock-geology
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/

Fungi
"Turtle Tortoise Sea" by kormandallas [CC0] (cropped) via Pixabay https://pixabay.com/photos/turtle-tortoise-sea-immersion-deep-2250720/
"Fungus Forest Mushroom" by HeyouRelax [CC0] (cropped) via Pixabay https://pixabay.com/photos/fungus-forest-mushroom-wild-2158028/
"leafy, background" by Leon Brooks [Public Domain] (cropped) via Pixnio https://pixnio.com/nature-landscapes/leaf-leaves/leafy-background
"Euglena Microorganisms Nutrition" by ep793 [CC0] (cropped) via Pixabay https://pixabay.com/illustrations/euglena-microorganisms-nutrition-2320760/
"Halobacteria" by NASA [Public Domain] (cropped) via Wikimedia Commons https://ca.m.wikipedia.org/wiki/Fitxer:Halobacteria.jpg
"Under a very high magnification of 20000X, this colorized scanning electron micrograph (SEM) revealed the presence of a single Gram-negative" by CDC/ Bette Jensen [Public Domain] (cropped) via Public Domain Files http://www.publicdomainfiles.com/show_file.php?id=13489041618725
"Unusual Bracket Fungi Yellow" by GeorgeB2 [CC0] (cropped) via Pixabay https://pixabay.com/photos/unusual-bracket-fungi-yellow-rust-3811395/
"Lemon Rotten Fruit" by dimitrisvetsikas1969 [CC0] (cropped) via Pixabay https://pixabay.com/photos/lemon-rotten-fruit-yellow-green-2146987/

gamete/sex cell
"Baby Babyhood Childhood" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/baby-babyhood-childhood-cradle-2023174/
"Reproductive System" by Siyavula Education [CC BY 2.0] (labels removed) via Flickr https://www.flickr.com/photos/121935927@N06/13578806453
"DNA mutation" by Mouagip [Public Domain] (recolored, cropped and labels removed) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:DNA_UV_mutation.svg
"Reproduction Impregnation" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/reproduction-impregnation-150566/

gene
"DNA mutation" by Mouagip [Public Domain] (recolored, cropped and labels removed) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:DNA_UV_mutation.svg
"Icons Information Rodentia" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/icons-information-rodentia-icons-1294597/

gene expression
"DNA mutation" by Mouagip [Public Domain] (recolored, cropped and labels removed) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:DNA_UV_mutation.svg
"Ipilimumab 5TRU" by Fvasconcellos [Public Domain] (no alterations) via Wikimedia Commmons https://commons.wikimedia.org/wiki/File:Ipilimumab_5TRU.png
"Switch Light Off" by Clker-Free-Vector-Images [CC0] (cropped) via Pixabay https://pixabay.com/vectors/switch-light-off-position-panel-36000/
"Light Switch Plate Electric" by Clker-Free-Vector-Images [CC0] (cropped) via Pixabay https://pixabay.com/vectors/light-switch-switch-plate-37017/

gene flow
"Flying Birds Black" by Clker-Free-Vector-Images [CC0] (cropped, rotated, and recolored) via Pixabay https://pixabay.com/vectors/flying-birds-black-white-wings-35928/
"Bird Feathers Meadowlark" by Clker-Free-Vector-Images [CC0] (recolored and rotated) via Pixabay https://pixabay.com/vectors/bird-feathers-meadowlark-nature-40221/
"DNA mutation" by Mouagip [Public Domain] (cropped, recolored and labels removed) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:DNA_UV_mutation.svg

gene frequency
"Ladybug Insect Vector" by Frantisek_Krejci [CC0] (rotated and spots removed) via Pixabay https://pixabay.com/vectors/ladybug-insect-vector-garden-1969180/

genetic code
"Traffic Sign Road Shield" by CopyrightFreePictures [CC0] (no alterations) via Pixabay https://pixabay.com/illustrations/traffic-sign-road-sign-shield-6627/

genetic drift
"Rabbit Silhouette Black Isolated" by Gorkhs [CC0] (recolored) via Pixabay https://pixabay.com/en/rabbit-silhouette-black-2262101/
"Forest Trees Evergreen" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/forest-trees-evergreen-conifers-310072/
"Fire Flames Hell" by Clker-Free-Vector-Images [CC0] (stretched and rotated) via Pixabay https://pixabay.com/vectors/fire-flames-hell-burn-bright-307336/

genetic material
"Reproduction Impregnation" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/reproduction-impregnation-150566/
"DNA mutation" by Mouagip [Public Domain] (recolored, cropped and labels removed) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:DNA_UV_mutation.svg
"Virus Bacteriophage Biology" by OpenClipart-Vectors [CC0] (brightened) via Pixabay https://pixabay.com/vectors/virus-bacteriophage-biology-disease-149183/

genome
"Karyotype of normal male mouse" by L. Gabriel Sanchez-Partida, Richard D. W. Kelly, Huseyin Sumer, Camden Y. Lo, Rotem Aharon, Michael K. Holland, Moira K. O'Bryan, Justin C. St. John [CC BY 2.5] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Karyotype_of_normal_male_mouse.png
"DNA mutation" by Mouagip [Public Domain] (recolored, cropped and labels removed) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:DNA_UV_mutation.svg

genotype
"Eye brown" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/eye-brown-eye-brown-face-girl-157815/

genus
"Amurtiger Tiger Big Cat" by Pixel-mixer [CC0] (cropped) via Pixabay https://pixabay.com/photos/amurtiger-tiger-big-cat-siberian-1975790/
"Lion Wildcat Safari" by designerpoint [CC0] (cropped) via Pixabay https://pixabay.com/photos/lion-wildcat-safari-africa-515030/
"Leopard Big Cat Savuti" by hbieser [CC0] (cropped) via Pixabay https://pixabay.com/photos/leopard-big-cat-savuti-botswana-694460/

geotropism
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/
"Development Germinating" by OpenClipart-Vectors [CC0] (cropped and rotated) via Pixabay https://pixabay.com/en/development-germinating-germination-1300176/

glucose
"Human body silhouette" by Mikael Häggström [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Human_body_silhouette.svg
"Carrot Orange" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/carrot-orange-carrot-vegetables-1299147/
"Animal mitochondrion diagram unlabeled" by LadyofHats [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Animal_mitochondrion_diagram_unlabelled.svg

Golgi body/apparatus
"201601 golgi body" by DataBase Center for Life Science (DBCLS) [CC BY 4.0] (recolored) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:201601_golgi_body.png

guard cell
"Stem Leaves Paris Parts Plant" by Unknown [CC0] (no alterations) via Max Pixel https://www.maxpixel.net/Stem-Leaves-Paris-Plants-Leaf-2082612
"Rg1024 Set of water drops" by rg1024 [CC0 1.0] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Rg1024_Set_of_water_drops.svg

habitat
"Forest Fern Nature" by Bieniu94 [CC0] (cropped) via Pixabay https://pixabay.com/en/forest-fern-nature-photo-picture-3492362/
"Polar Bear Snow Predator" by kalhh [CC0] (cropped) via Pixabay https://pixabay.com/en/polar-bear-snow-predator-cold-3629687/
"Desert tortoise (Gopherus agassizii)" by Robb Hannawacker [CC0] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Desert_tortoise_(Gopherus_agassizii).jpg
"House Home White" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/house-home-white-shapes-chimney-48764/

haploid
"Reproduction Impregnation" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/reproduction-impregnation-150566/
"Haploid vs diploid" by Ehamberg [CC BY-SA 3.0] (cropped, brightened, and labels removed) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Haploid_vs_diploid.svg

herbivore
"Deer Male Animal" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/deer-male-animal-mammal-antlers-48417/
"Rabbit Silhouette Black Isolated" by Gorkhs [CC0] (no alterations) via Pixabay https://pixabay.com/en/rabbit-silhouette-black-2262101/
"Checkmark green" by Nobbler 76 [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Checkmark_green.svg

heterotroph
"Turtle Tortoise Sea" by kormandallas [CC0] (cropped) via Pixabay https://pixabay.com/photos/turtle-tortoise-sea-immersion-deep-2250720/
"Fungus Forest Mushroom" by HeyouRelax [CC0] (cropped) via Pixabay https://pixabay.com/photos/fungus-forest-mushroom-wild-2158028/
"leafy, background" by Leon Brooks [Public Domain] (cropped) via Pixnio https://pixnio.com/nature-landscapes/leaf-leaves/leafy-background
"Euglena Microorganisms Nutrition" by ep793 [CC0] (cropped) via Pixabay https://pixabay.com/illustrations/euglena-microorganisms-nutrition-2320760/
"Halobacteria" by NASA [Public Domain] (cropped) via Wikimedia Commons https://ca.m.wikipedia.org/wiki/Fitxer:Halobacteria.jpg
"Under a very high magnification of 20000X, this colorized scanning electron micrograph (SEM) revealed the presence of a single Gram-negative" by CDC/ Bette Jensen [Public Domain] (cropped) via Public Domain Files http://www.publicdomainfiles.com/show_file.php?id=13489041618725
"Cougar Mountain Lion" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/cougar-mountain-lion-wild-animal-47667/
"Rabbit Silhouette Black Isolated" by Gorkhs [CC0] (no alterations) via Pixabay https://pixabay.com/en/rabbit-silhouette-black-2262101/
"Dandelion Flower Yellow" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/dandelion-flower-yellow-plant-weed-31406/
"Mushroom Cartoon Fungus" by basker_Dhandapani [CC0] (no alterations) via Pixabay https://pixabay.com/illustrations/mushroom-cartoon-fungus-vegetable-2844146/

heterozygous
"Reproduction Impregnation" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/reproduction-impregnation-150566/

homeostasis
This image was created solely by Stephen Fleenor, PhD (Seidlitz Education)

homologous chromosome
"Karyotype of normal male mouse" by L. Gabriel Sanchez-Partida, Richard D. W. Kelly, Huseyin Sumer, Camden Y. Lo, Rotem Aharon, Michael K. Holland, Moira K. O'Bryan, Justin C. St. John [CC BY 2.5] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Karyotype_of_normal_male_mouse.png
"Reproduction Impregnation" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/reproduction-impregnation-150566/

homology
"Human body silhouette" by Mikael Häggström [Public Domain] (recolored) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Human_body_silhouette.svg
"Magpie Songbird Bird" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/magpie-songbird-bird-song-melody-147852/
"Car Sport Sports" by OpenClipart-Vectors [CC0] (rotated) via Pixabay https://pixabay.com/vectors/car-sport-sports-car-automobile-160895/
"Sports Car Classic Racing" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/sports-car-classic-car-racing-car-146185/
"Tangerine Orange Mandarin" by OpenClipart-Vectors [CC0] (no alterations) via Pixababy https://pixabay.com/vectors/tangerine-orange-mandarin-151616/
"Orange Fruit Mandarin Citrus" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/orange-fruit-mandarin-citrus-fruit-158258/

homozygous
"Reproduction Impregnation" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/reproduction-impregnation-150566/

host
"Remora and shark" by Brian Snelson [CC BY 2.0] (no alterations) via Flickr https://www.flickr.com/photos/exfordy/2950573720
"Mosquito Biting Female" by 272447 [CC0] (no alterations) via Pixabay https://pixabay.com/photos/mosquito-biting-female-parasite-542156/

hydrogen bond
"DNA mutation" by Mouagip [Public Domain] (recolored, cropped and labels removed) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:DNA_UV_mutation.svg

hydrophilic
"Drops of Liquid Water" by ronymichaud [CC0] (cropped) via Pixabay https://pixabay.com/photos/drops-of-water-water-liquid-fresh-578897/
"Beaker Chemistry Empty" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/beaker-chemistry-empty-glasswares-159174/

hydrophobic
"Splashing Splash Aqua" by PublicDomainPictures [CC0] (cropped) via Pixabay https://pixabay.com/photos/splashing-splash-aqua-water-164964/
"Comic Fear Flee" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/comic-fear-flee-fright-1296117/
"Beaker Chemistry Empty" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/beaker-chemistry-empty-glasswares-159174/

immune cells
"bacteria illness bacterium infection" by Unknown [CC0] via SVG Silh https://svgsilh.com/image/156869.html
"Human body silhouette" by Mikael Häggström [Public Domain] via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Human_body_silhouette.svg

immune system
"Human body silhouette" by Mikael Häggström [Public Domain] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Human_body_silhouette.svg
"bacteria illness bacterium infection" by Unknown [CC0] (recolored) via SVG Silh https://svgsilh.com/image/156869.html
"bacteria illness bacterium infection" by Unknown [CC0] (recolored) via SVG Silh https://svgsilh.com/image/156867.html
"bacterium h bacterium" by Unknown [CC0] (recolored) via SVG Silh https://svgsilh.com/image/1455818.html
"Bricks Wall" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/en/bricks-wall-red-161235/

impact
"Rabbit Silhouette Black Isolated" by Gorkhs [CC0] (recolored) via Pixabay https://pixabay.com/en/rabbit-silhouette-black-2262101/
"Moose Large Body" by Clker-Free-Vector-Images [CC0] (recolored) via Pixabay https://pixabay.com/en/moose-large-body-animal-mammal-48465/
"Caterpillar Monarch Butterfly" by OpenClipart-Vectors [CC0] (recolored) via Pixabay https://pixabay.com/en/caterpillar-monarch-butterfly-156937/
"Pond Water Outdoor" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/pond-water-outdoor-grass-outdoors-310149/

incomplete dominance
"Reproduction Impregnation" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/reproduction-impregnation-150566/
"Rose Blossom Full" by Clker-Free-Vector-Images [CC0] (recolored) via Pixabay https://pixabay.com/vectors/rose-blossom-full-bloom-flower-305214/

infect
"Virus Bacteriophage Biology" by OpenClipart-Vectors [CC0] (brightened) via Pixabay https://pixabay.com/vectors/virus-bacteriophage-biology-disease-149183/
"DNA mutation" by Mouagip [Public Domain] (recolored, cropped and labels removed) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:DNA_UV_mutation.svg

inherited trait
"DNA mutation" by Mouagip [Public Domain] (recolored, cropped and labels removed) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:DNA_UV_mutation.svg
"Mouse Brown Pink" by Clker-Free-Vector-Images [CC0] (rotated) via Pixabay https://pixabay.com/vectors/mouse-brown-pink-cute-ears-tail-304966/
"Mouse Rodent Black" by Clker-Free-Vector-Images [CC0] (rotated) via Pixabay https://pixabay.com/vectors/mouse-rodent-black-animal-cute-303746/
"Mouse Rodent Rat" by Clker-Free-Vector-Images [CC0] (rotated) via Pixabay https://pixabay.com/vectors/mouse-rodent-rat-black-cute-296396/

integumentary system
"Human body silhouette" by Mikael Häggström [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Human_body_silhouette.svg
"bacteria illness bacterium infection" by Unknown [CC0] (recolored) via SVG Silh https://svgsilh.com/image/156869.html
"bacteria illness bacterium infection" by Unknown [CC0] (recolored) via SVG Silh https://svgsilh.com/image/156867.html
"bacterium h bacterium" by Unknown [CC0] (recolored) via SVG Silh https://svgsilh.com/image/1455818.html

interaction
"Digestive system without labels" by LadyOfHats [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Digestive_system_without_labels.svg
"Apple Slice Fruit" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/apple-slice-fruit-food-juicy-ripe-31768/
"Anatomy Blood Vessel" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/en/anatomy-blood-vessel-red-156854/
"Skeletal muscle" by Unknown [CC0 1.0] (cropped and rotated) via FreeSVG https://freesvg.org/skeletal-muscle
"Bone Leg Femur" by b0red [CC0 ] (cropped) via Pixabay https://pixabay.com/vectors/bone-leg-bone-femur-human-medical-2937723/
"Stem Leaves Paris Parts Plant" by Unknown [CC0] (no alterations) via Max Pixel https://www.maxpixel.net/Stem-Leaves-Paris-Plants-Leaf-2082612
"Dicotyledoneae Asteraceae herb - root system, primary root becomes tap root and lateral roots" by RoRo [CC0 1.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Dicotyledoneae_Asteraceae_herb_-_root_system,_primary_root_becomes_tap_root_and_lateral_roots.JPG
"Brain Human Anatomy" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/brain-human-anatomy-body-155656/
"Neuron Nerve Cell Axon" by Clker-Free-Vector-Images [CC0] (cropped) via Pixabay https://pixabay.com/vectors/neuron-nerve-cell-axon-dendrite-296581/

interphase
"Mitosis in onion cells" by Roval312 [CC BY-SA 4.0] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Mitosis_in_onion_cells.jpg
"Analysis Biology Cell" by OpenClipart-Vectors [CC0] (figure and cells removed) via Pixabay https://pixabay.com/vectors/analysis-biology-cell-cell-culture-2025834/

invasive species
"Rabbit Silhouette Black Isolated" by Gorkhs [CC0] (recolored) via Pixabay https://pixabay.com/en/rabbit-silhouette-black-2262101/
"Simple world map" by Tom-b [CC0 1.0] (cropped and recolored) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Simple_world_map.svg
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/

isolation
"Gorge Du Vernon France Provence" by MissEJB [CC0] (cropped) via Pixabay https://pixabay.com/photos/gorge-du-verdon-france-provence-969748/
"Squirrel Animal" by harshal07 [CC0] (recolored and rotated) via Pixabay https://pixabay.com/vectors/squirrel-animal-pet-1456764/

law of independent assortment
"Reproduction Impregnation" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/reproduction-impregnation-150566/
"Male Toilet Public" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/male-toilet-public-bathroom-44078/

law of segregation
"Reproduction Impregnation" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/reproduction-impregnation-150566/
"Male Toilet Public" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/male-toilet-public-bathroom-44078/

lipid
"Human body silhouette" by Mikael Häggström [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Human_body_silhouette.svg
"Butter and Oil - NCI Visuals Online" by Bill Branson [Public Domain] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Butter_and_Oil_-_NCI_Visuals_Online.jpg
"Cholesterol Chemical Structure" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/cholesterol-chemical-structure-149091/
"0302 Phospholipid Bilayer labeled" by OpenStax [CC BY 3.0] (labels removed and cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:0302_Phospholipid_Bilayer_labeled.jpg

lysogenic cycle
"Virus Bacteriophage Biology" by OpenClipart-Vectors [CC0] (brightened) via Pixabay https://pixabay.com/vectors/virus-bacteriophage-biology-disease-149183/
"DNA mutation" by Mouagip [Public Domain] (recolored, cropped and labels removed) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:DNA_UV_mutation.svg

lysosome
"Truck Delivery Box Vehicle Car Transport Shipping" by Unknown [CC0] (cropped and recolored) via Max Pixel https://www.maxpixel.net/Truck-Delivery-Box-Vehicle-Car-Transport-Shipping-2181037

lytic cycle
"Virus Bacteriophage Biology" by OpenClipart-Vectors [CC0] (brightened) via Pixabay https://pixabay.com/vectors/virus-bacteriophage-biology-disease-149183/
"DNA mutation" by Mouagip [Public Domain] (recolored, cropped and labels removed) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:DNA_UV_mutation.svg

malignant
"Human body silhouette" by Mikael Häggström [Public Domain] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Human_body_silhouette.svg
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/

meiosis
This image was created solely by Stephen Fleenor, PhD (Seidlitz Education)

mesophyll cell
"Stem Leaves Paris Parts Plant" by Unknown [CC0] (no alterations) via Max Pixel https://www.maxpixel.net/Stem-Leaves-Paris-Plants-Leaf-2082612

microorganism
"Soil Earth Excavation" by OpenClipart-Vectors [CC0] (recolored and cropped) via Pixabay https://pixabay.com/vectors/soil-earth-excavation-exposed-575643/
"bacteria illness bacterium infection" by Unknown [CC0] (recolored) via SVG Silh https://svgsilh.com/image/156869.html
"Protozoan Microbes Biology" by dbutlerdidit [CC0] (no alterations) via Pixabay https://pixabay.com/illustrations/protozoans-microbes-biology-science-1450090/
"DNA Infection Bacteria Bacterium Virus Cell" by Unknown [CC0] (recolored) via Max Pixel https://www.maxpixel.net/Dna-Infection-Bacteria-Bacterium-Virus-Cell-213708
"EscherichiaColi NIAID" by Rocky Mountain Laboratories, NIAID, NIH [Public Domain] (recolored) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:EscherichiaColi_NIAID.jpg
"Human body silhouette" by Mikael Häggström [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Human_body_silhouette.svg

mimicry
"Skull and crossbones" by Unknown [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Skull_and_crossbones.svg
"Eagle Bird Animal" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/eagle-bird-animal-flying-162195/
Untitled by Unknown [CC0] (cropped and rotated) via Pxhere https://pxhere.com/en/photo/86151
"Snake False Coral" by mgrpowerlifting [CC0] (cropped) via Pixabay https://pixabay.com/photos/snake-false-coral-reptile-2379192/

mitochondria/mitochondrion
"Animal mitochondrion diagram unlabeled" by LadyofHats [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Animal_mitochondrion_diagram_unlabelled.svg

mitosis
"Mitosis in onion cells" by Roval312 [CC BY-SA 4.0] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Mitosis_in_onion_cells.jpg
"Analysis Biology Cell" by OpenClipart-Vectors [CC0] (figure and cells removed) via Pixabay https://pixabay.com/vectors/analysis-biology-cell-cell-culture-2025834/

molecular homology
"Caterpillar Monarch Butterfly" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/en/caterpillar-monarch-butterfly-156937/
"DNA mutation" by Mouagip [Public Domain] (cropped and labels removed) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:DNA_UV_mutation.svg
"Monarch Butterfly" by Unknown [CC0] (rotated) via PublicDomainPictures https://www.publicdomainpictures.net/en/view-image.php?image=262639&picture=monarch-butterfly
"Human body silhouette" by Mikael Häggström [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Human_body_silhouette.svg
"Baer embryos" by Romanes, G. J. after Haeckel, E. [Public Domain] (recolored) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Baer_embryos.png

molecule
"Animal mitochondrion diagram unlabeled" by LadyofHats [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Animal_mitochondrion_diagram_unlabelled.svg

monohybrid cross
"Reproduction Impregnation" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/reproduction-impregnation-150566/
"Male Toilet Public" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/male-toilet-public-bathroom-44078/
"Female Girl Symbol" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/female-girl-symbol-toilet-bathroom-297734/
"Baby Babyhood Childhood" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/baby-babyhood-childhood-cradle-2023174/

monomer
Untitled by Unknown [CC0 1.0] (figure removed) via Pxhere https://pxhere.com/en/photo/1175223
"Book Read Learn" by ulleo [CC0] (no alterations) via Pixabay https://pixabay.com/photos/book-read-learn-text-literature-2306181/

mortality rate
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/
"Dead mouse" by Madprime [CC0 1.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Dead_mouse.svg
"Mouse" by Madprime (assumed) [CC0 1.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Mouse.svg

mRNA
"Icons Information Rodentia" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/icons-information-rodentia-icons-1294597/

muscular system
"2006 Heart Musculature" by OpenStax College [CC BY 3.0] (labels removed) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:2006_Heart_Musculature.jpg "1021 Smooth Muscle new" by OpenStax [CC BY 4.0] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:1021_Smooth_Muscle_new.jpg
"Muscular system" by Termininja [CC BY-SA 3.0] (no alternations) via Wikimedia Commons https://upload.wikimedia.org/wikipedia/commons/archive/1/13/20120816180041%21Muscular_system.svg
"Skeletal muscle" by Unknown [CC0 1.0] (cropped and rotated) via FreeSVG https://freesvg.org/skeletal-muscle
"Bone Leg Femur" by b0red [CC0 ] (cropped) via Pixabay https://pixabay.com/vectors/bone-leg-bone-femur-human-medical-2937723/

mutation
This image was created solely by Stephen Fleenor, PhD (Seidlitz Education)

mutualism
"Smiley Face Smile" by PixLoger [CC0] (no alterations) via Pixabay https://pixabay.com/en/smiley-face-smile-good-nice-3189739/
"Anemones Tentacle Sea" by Efraimstochter [CC0] (no alterations) via Pixabay https://pixabay.com/photos/anemones-tentacle-sea-anemones-793401/
"Home House Icons Jims" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/home-house-icons-jims-card-1294564/
"Fruits Vegetables Artichoke" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/fruits-vegetables-artichoke-banana-155616/
"Soil Eart Poo" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/soil-eart-poo-brown-dirt-heap-576296/

native
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/
"World map longlat-simple" by Thesevenseas [CC BY-SA 3.0] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:World_map_longlat-simple.svg

natural disaster
"Fire-Forest" by Cameron Strandberg [CC BY 2.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Fire-Forest.jpg
"Puu Oo cropped" by G.E. Ulrich, USGS [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Puu_Oo_cropped.jpg
"GOES-16 image of hurricanes Katia, Irma and Jose on September 8, 2017" by NOAA [Public Domain] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:GOES-16_image_of_hurricanes_Katia,_Irma_and_Jose_on_September_8,_2017.jpg
"nssl0210" by NOAA Photo Library [CC BY 2.0] (no alterations) via Flickr https://www.flickr.com/photos/noaaphotolib/5054533468

natural selection
"Nature Tree Orange" by Gellinger [CC0] (trunk elongated and cropped) via Pixabay https://pixabay.com/photos/nature-tree-orange-orange-tree-2444640/
"Giraffe Nature Africa" by OpenClipart-Vectors [CC0] (neck and legs shortened) via Pixabay https://pixabay.com/vectors/giraffe-nature-africa-safari-152607/

nervous system
"Nervous system diagram unlabeled" by Medium69 and Jmarchn [CC BY-SA 4.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Nervous_system_diagram_unlabeled.svg

nitrogen cycle
"Stem Leaves Paris Parts Plant" by Unknown [CC0] (no alterations) via Max Pixel https://www.maxpixel.net/Stem-Leaves-Paris-Plants-Leaf-2082612
"Dicotyledoneae Asteraceae herb - root system, primary root becomes tap root and lateral roots" by RoRo [CC0 1.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Dicotyledoneae_Asteraceae_herb_-_root_system,_primary_root_becomes_tap_root_and_lateral_roots.JPG
"bacteria illness bacterium infection" by Unknown [CC0] (recolored) via SVG Silh https://svgsilh.com/image/156869.html

nitrogen fixation
"bacteria illness bacterium infection" by Unknown [CC0] (recolored) via SVG Silh https://svgsilh.com/image/156869.html
"Thunderstorm Clouds Lightning" by OpenClipart-Vectors" [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/thunderstorm-clouds-lightning-rain-154856/
"Stem Leaves Paris Parts Plant" by Unknown [CC0] (no alterations) via Max Pixel https://www.maxpixel.net/Stem-Leaves-Paris-Plants-Leaf-2082612
"Dicotyledoneae Asteraceae herb - root system, primary root becomes tap root and lateral roots" by RoRo [CC0 1.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Dicotyledoneae_Asteraceae_herb_-_root_system,_primary_root_becomes_tap_root_and_lateral_roots.JPG

nitrogenous base
"DNA mutation" by Mouagip [Public Domain] (recolored, cropped and labels removed) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:DNA_UV_mutation.svg

nondisjunction
"Checkmark green" by Nobbler 76 [Public Domain] (no alterations) via Wikimedia Commons https://en.wikipedia.org/wiki/File:Checkmark_green.svg
"Exclamation Mark Point Triangle" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/exclamation-mark-point-triangle-24144/

non‐Mendelian
"Rose Blossom Full" by Clker-Free-Vector-Images [CC0] (recolored) via Pixabay https://pixabay.com/vectors/rose-blossom-full-bloom-flower-305214/

non‐random mating
"Baby Babyhood Childhood" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/baby-babyhood-childhood-cradle-2023174/
"Male Toilet Public" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/male-toilet-public-bathroom-44078/
"Female Girl Symbol" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/female-girl-symbol-toilet-bathroom-297734/

nucleic acid
"DNA mutation" by Mouagip [Public Domain] (recolored, cropped and labels removed) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:DNA_UV_mutation.svg
"Zelkova Serrata Tree Bonsai" by Deedster [CC0] (cropped, rotated and brightened) via Pixabay https://pixabay.com/en/zelkova-serrata-tree-bonsai-zelkova-1613784/
"Rabbit Silhouette Black Isolated" by Gorkhs [CC0] (no alterations) via Pixabay https://pixabay.com/en/rabbit-silhouette-black-2262101/
"Animal mitochondrion diagram unlabeled" by LadyofHats [Public Domain] (glow added) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Animal_mitochondrion_diagram_unlabelled.svg
"Zelkova Serrata Tree Bonsai" by Deedster [CC0] (cropped, rotated and brightened) via Pixabay https://pixabay.com/en/zelkova-serrata-tree-bonsai-zelkova-1613784/
"Icons Information Rodentia" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/icons-information-rodentia-icons-1294597/

nucleotide
"DNA mutation" by Mouagip [Public Domain] (recolored, cropped and labels removed) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:DNA_UV_mutation.svg

nucleus (cellular)
"DNA mutation" by Mouagip [Public Domain] (recolored, cropped and labels removed) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:DNA_UV_mutation.svg
"Diagram human cell nucleus no text" by Mariana Ruiz Villareal LadyofHats and Peter Znamenskiy [Public Domain] (recolored and cropped) via Wikimedia Commons https://en.wikipedia.org/wiki/File:Diagram_human_cell_nucleus_no_text.png
"Icons Information Rodentia" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/icons-information-rodentia-icons-1294597/

nutrient absorption
"Digestive system without labels" by LadyOfHats [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Digestive_system_without_labels.svg
"Apple Slice Fruit" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/apple-slice-fruit-food-juicy-ripe-31768/
"Anatomy Blood Vessel" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/en/anatomy-blood-vessel-red-156854/

offspring
"Mouse Brown Pink" by Clker-Free-Vector-Images [CC0] (rotated) via Pixabay https://pixabay.com/vectors/mouse-brown-pink-cute-ears-tail-304966/
"Mouse Rodent Black" by Clker-Free-Vector-Images [CC0] (rotated) via Pixabay https://pixabay.com/vectors/mouse-rodent-black-animal-cute-303746/
"Mouse Rodent Rat" by Clker-Free-Vector-Images [CC0] (rotated) via Pixabay https://pixabay.com/vectors/mouse-rodent-rat-black-cute-296396/
"Simple diagram of bacterium (blank)" by domdomegg [CC BY 4.0] (rotated and DNA removed) via Wikimedia Commons
"Zelkova Serrata Tree Bonsai" by Deedster [CC0] (cropped, rotated and brightened) via Pixabay https://pixabay.com/en/zelkova-serrata-tree-bonsai-zelkova-1613784/
"Seedling Seed Growth" by REDQUASAR [CC0] (no alterations) via Pixabay https://pixabay.com/illustrations/seedling-seed-growth-plant-green-2163773/
"Park Acorns Oak" by pasja1000 [CC0] (croppped) via Pixabay https://pixabay.com/photos/park-acorns-oak-foliage-plant-3682796/

omnivore
"Brown Bear Standing" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/brown-bear-standing-animal-fur-48446/
"Rabbit Silhouette Black Isolated" by Gorkhs [CC0] (no alterations) via Pixabay https://pixabay.com/en/rabbit-silhouette-black-2262101/
"Checkmark green" by Nobbler 76 [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Checkmark_green.svg

organ
"Digestive system without labels" by LadyOfHats [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Digestive_system_without_labels.svg
"Stomach Muscles Muscle Layers" by LillyCantabile [CC0] (no alterations) via Pixabay https://pixabay.com/illustrations/stomach-muscles-muscle-layers-3329346/
"The Larynx Pharynx Anatomy" by ikkilacerda [CC0] (cropped) via Pixabay https://pixabay.com/illustrations/the-larynx-the-pharynx-anatomy-2381980/
"Liver Organ Anatomy" by LillyCantabile [CC0] (no alterations) via Pixabay https://pixabay.com/illustrations/liver-organ-anatomy-brown-3332302/

organ system
"Digestive system without labels" by LadyOfHats [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Digestive_system_without_labels.svg
"Circulatory System no tags" by LadyofHats [Public Domain] (no alterations) via Wikimedia Commons https://zh-yue.wikipedia.org/wiki/File:Circulatory_System_no_tags.svg
"Reproductive System" by Siyavula Education [CC BY 2.0] (labels removed and cropped) via Flickr https://www.flickr.com/photos/121935927@N06/13578806453
"Anatomy Lungs Breathing" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/anatomy-lungs-breathing-human-145696/

organelle
"DNA mutation" by Mouagip [Public Domain] (recolored, cropped and labels removed) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:DNA_UV_mutation.svg
"Diagram human cell nucleus no text" by Mariana Ruiz Villareal LadyofHats and Peter Znamenskiy [Public Domain] (recolored) via Wikimedia Commons https://en.wikipedia.org/wiki/File:Diagram_human_cell_nucleus_no_text.png
"Animal mitochondrion diagram unlabeled" by LadyofHats [Public Domain] (glow added) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Animal_mitochondrion_diagram_unlabelled.svg
"0313 Endoplasmic Reticulum a labeled" by OpenStax [CC BY 3.0] (labels removed) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:0313_Endoplasmic_Reticulum_a_labeled.png

organism
"Brown Bear Standing" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/brown-bear-standing-animal-fur-48446/
"Protozoan Microbes Biology" by dbutlerdidit [CC0] (no alterations) via Pixabay https://pixabay.com/illustrations/protozoans-microbes-biology-science-1450090/
"Zelkova Serrata Tree Bonsai" by Deedster [CC0] (cropped and rotated) via Pixabay https://pixabay.com/en/zelkova-serrata-tree-bonsai-zelkova-1613784/
"Beedle Insect Bug" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/beetle-insect-bug-blue-black-legs-34372/
"Stem Leaves Paris Parts Plant" by Unknown [CC0] (no alterations) via Max Pixel https://www.maxpixel.net/Stem-Leaves-Paris-Plants-Leaf-2082612
"Mushroom Cartoon Fungus" by basker_Dhandapani [CC0] (no alterations) via Pixabay https://pixabay.com/illustrations/mushroom-cartoon-fungus-vegetable-2844146/
"Rock Stone Moos" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/rock-stone-moos-moss-158022/

osmosis
"Rg1024 Set of water drops" by rg1024 [CC0 1.0] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Rg1024_Set_of_water_drops.svg
"Osmotic pressure on blood cells diagram" by LadyofHats [Public Domain] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Osmotic_pressure_on_blood_cells_diagram.svg

oxygen
"Rabbit Silhouette Black Isolated" by Gorkhs [CC0] (no alterations) via Pixabay https://pixabay.com/en/rabbit-silhouette-black-2262101/
"Zelkova Serrata Tree Bonsai" by Deedster [CC0] (cropped, rotated and brightened) via Pixabay https://pixabay.com/en/zelkova-serrata-tree-bonsai-zelkova-1613784/

parasitism/parasite
"Smiley Face Smile" by PixLoger [CC0] (no alterations) via Pixabay https://pixabay.com/en/smiley-face-smile-good-nice-3189739/
"Smiley Face Bad" by PixLoger [CC0] (no alterations) via Pixabay https://pixabay.com/en/smiley-face-bad-sad-3189737/
"Mosquito Biting Female" by 272447 [CC0] (no alterations) via Pixabay https://pixabay.com/photos/mosquito-biting-female-parasite-542156/

passive transport
"0302 Phospholipid Bilayer labeled" by OpenStax [CC BY 3.0] (labels removed and cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:0302_Phospholipid_Bilayer_labeled.jpg
"0303 Lipid Bilayer With Various Components labeled" by OpenStax [CC BY 3.0] (protein channels isolated) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:0303_Lipid_Bilayer_With_Various_Components_labeled.jpg

pathogen
"Human body silhouette" by Mikael Häggström [Public Domain] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Human_body_silhouette.svg
"bacteria illness bacterium infection" by Unknown [CC0] (recolored) via SVG Silh https://svgsilh.com/image/156869.html
"bacteria illness bacterium infection" by Unknown [CC0] (recolored) via SVG Silh https://svgsilh.com/image/156867.html
"bacterium h bacterium" by Unknown [CC0] (recolored) via SVG Silh https://svgsilh.com/image/1455818.html
"Skull and crossbones" by Unknown [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Skull_and_crossbones.svg

phase
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/
"Adult Age Baby" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/adult-age-baby-child-death-human-2028245/

phenotype
"Eye brown" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/eye-brown-eye-brown-face-girl-157815/
"Maple Leaf Green" by Sweetaholic [CC0] (no alterations) via Pixabay https://pixabay.com/photos/maple-leaf-green-maple-leaf-tree-888807/

phloem
"Stem Leaves Paris Parts Plant" by Unknown [CC0] (no alterations) via Max Pixel https://www.maxpixel.net/Stem-Leaves-Paris-Plants-Leaf-2082612
"Dicotyledoneae Asteraceae herb - root system, primary root becomes tap root and lateral roots" by RoRo [CC0 1.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Dicotyledoneae_Asteraceae_herb_-_root_system,_primary_root_becomes_tap_root_and_lateral_roots.JPG
"Rg1024 Set of water drops" by rg1024 [CC0 1.0] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Rg1024_Set_of_water_drops.svg

phosphate
"DNA mutation" by Mouagip [Public Domain] (recolored, cropped and labels removed) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:DNA_UV_mutation.svg
"0302 Phospholipid Bilayer labeled" by OpenStax [CC BY 3.0] (labels removed and cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:0302_Phospholipid_Bilayer_labeled.jpg

phospholipid
"0302 Phospholipid Bilayer labeled" by OpenStax [CC BY 3.0] (labels removed and cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:0302_Phospholipid_Bilayer_labeled.jpg

photosynthesis
"Zelkova Serrata Tree Bonsai" by Deedster [CC0] (cropped, rotated and brightened) via Pixabay https://pixabay.com/en/zelkova-serrata-tree-bonsai-zelkova-1613784/
"Rg1024 Set of water drops" by rg1024 [CC0 1.0] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Rg1024_Set_of_water_drops.svg

phototropism
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/
"Plant" by gsagri04 [Public Domain] (cropped and rotated) via Free Stock Photos http://www.freestockphotos.biz/stockphoto/15474

phylogenetic
"Chickadee Bird Animal" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/chickadee-bird-animal-wildlife-48019/
"Eel Fish Aquaculture" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/eel-fish-aquaculture-seafood-32679/
"Fish Scale Species" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/fish-scales-species-fins-water-48134/
"Gecko Tail Reptile" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/gecko-tail-reptile-crawling-lizard-48332/
"Frog Sitting Amphibian" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/frog-sitting-amphibian-wildlife-48498/
"Bear Grizzly Black" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/bear-grizzly-black-animal-mammal-38067/
"DNA mutation" by Mouagip [Public Domain] (cropped and labels removed) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:DNA_UV_mutation.svg

plant cell
"Zelkova Serrata Tree Bonsai" by Deedster [CC0] (cropped, rotated and brightened) via Pixabay https://pixabay.com/en/zelkova-serrata-tree-bonsai-zelkova-1613784/

Plantae
"Turtle Tortoise Sea" by kormandallas [CC0] (cropped) via Pixabay https://pixabay.com/photos/turtle-tortoise-sea-immersion-deep-2250720/
"Fungus Forest Mushroom" by HeyouRelax [CC0] (cropped) via Pixabay https://pixabay.com/photos/fungus-forest-mushroom-wild-2158028/
"leafy, background" by Leon Brooks [Public Domain] (cropped) via Pixnio https://pixnio.com/nature-landscapes/leaf-leaves/leafy-background
"Euglena Microorganisms Nutrition" by ep793 [CC0] (cropped) via Pixabay https://pixabay.com/illustrations/euglena-microorganisms-nutrition-2320760/
"Halobacteria" by NASA [Public Domain] (cropped) via Wikimedia Commons https://ca.m.wikipedia.org/wiki/Fitxer:Halobacteria.jpg
"Under a very high magnification of 20000X, this colorized scanning electron micrograph (SEM) revealed the presence of a single Gram-negative" by CDC/ Bette Jensen [Public Domain] (cropped) via Public Domain Files http://www.publicdomainfiles.com/show_file.php?id=13489041618725
"Eze jardin exotique" by Berthold Werner [Public Domain] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Eze_jardin_exotique.JPG
"Change Lake Grass" by telix2000 [CC0] (cropped) via Pixabay https://pixabay.com/photos/change-lake-grass-river-green-1931997/
"Tree Dawn Nature" by danfador [CC0] (cropped) via Pixabay https://pixabay.com/photos/tree-dawn-nature-bucovina-romania-338211/

polymer
"Brick Wall Stones" by Nikiko [CC0] (no alterations) via Pixabay https://pixabay.com/photos/bricks-wall-stones-structure-459299/
"Berg van stenen" by Tasja [Public Domain] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Berg_van_stenen.jpg

polypeptide
"Thyroxine-binding globulin 2CEO" by Fvaconcellos [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Thyroxine-binding_globulin_2CEO.png
"Crystatin C 1r4c" by Fvaconcellos [Public Domain] (recolored) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Cystatin_C_1r4c.png

population
"Rabbit Silhouette Black Isolated" by Gorkhs [CC0] (recolored) via Pixabay https://pixabay.com/en/rabbit-silhouette-black-2262101/
"Deer Male Animal" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/deer-male-animal-mammal-antlers-48417/

predation
"Smiley Face Smile" by PixLoger [CC0] (no alterations) via Pixabay https://pixabay.com/en/smiley-face-smile-good-nice-3189739/
"Smiley Face Bad" by PixLoger [CC0] (rotated) via Pixabay https://pixabay.com/en/smiley-face-bad-sad-3189737/
"Dead mouse" by Madprime [CC0 1.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Dead_mouse.svg
"Cougar Mountain Lion" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/cougar-mountain-lion-wild-animal-47667/

predator/prey
"Dead mouse" by Madprime [CC0 1.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Dead_mouse.svg
"Mouse" by Madprime (assumed) [CC0 1.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Mouse.svg
"Cougar Mountain Lion" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/cougar-mountain-lion-wild-animal-47667/

primary consumer
"Marine food web" by Siyavula Education [CC BY 2.0] (no alterations) via Flickr https://www.flickr.com/photos/121935927@N06/13578843423
"Checkmark green" by Nobbler 76 [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Checkmark_green.svg

primary succession
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/
"Grass Meadow Green" by OpenClipart-Vectors [CC0] (recolored) via Pixabay https://pixabay.com/vectors/grass-meadow-green-agriculture-159804/
"Lichen Stone Rock" by aitoff [CC0] (cropped) via Pixabay https://pixabay.com/photos/lichen-stone-rock-old-patina-620136/
"Húsafell Stone" by Pudpon [CC0 1.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:H%C3%BAsafell_Stone.png

probability
"Dice Lido Rolling" by kreatikar [CC0] (cropped) via Pixabay https://pixabay.com/illustrations/dice-lido-rolling-play-numbers-3713718/
"Uncertainty" by Nicu Buculei [CC BY-SA 2.0] (cropped) via Flickr https://www.flickr.com/photos/nicubunuphotos/5262645427

producer
"Marine food web" by Siyavula Education [CC BY 2.0] (no alterations) via Flickr https://www.flickr.com/photos/121935927@N06/13578843423
"Checkmark green" by Nobbler 76 [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Checkmark_green.svg

product
"Zelkova Serrata Tree Bonsai" by Deedster [CC0] (cropped and rotated) via Pixabay https://pixabay.com/en/zelkova-serrata-tree-bonsai-zelkova-1613784/
"Húsafell Stone" by Pudpon [CC0 1.0] (rotated) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:H%C3%BAsafell_Stone.png
"Sports Car Classic Racing" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/sports-car-classic-car-racing-car-146185/
"Beaker Experiment Bubbles" by OpenClipart-Vectors [CC0] (recolored) via Pixabay https://pixabay.com/vectors/beaker-experiment-bubbles-chemistry-148167/
"Baking Soda Box White" by evitaochel [CC0] (cropped and brightened) via Pixabay https://pixabay.com/photos/baking-soda-box-white-powder-768950/
"Lumber Timber Truck Logging" by MemoryCatcher [CC0] (cropped) via Pixabay https://pixabay.com/photos/lumber-timber-truck-logging-1713722/
"Cotton Fruit Open Country" by pianweizhuannong [CC0] (cropped) via Pixabay https://pixabay.com/photos/cotton-fruit-open-country-flower-1721144/
"Factory Building Smoke" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixababy https://pixabay.com/vectors/factory-building-smoke-industry-48781/
"Paper ream stack." by unknown [CC0] (no alterations) via PICRYL https://picryl.com/media/paper-ream-stack-affb0a
"Toothbrush Toothpaste Tube" by gustavorezende [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/toothbrush-toothpaste-tube-dental-3171553/

prokaryote
"Turtle Tortoise Sea" by kormandallas [CC0] (cropped) via Pixabay https://pixabay.com/photos/turtle-tortoise-sea-immersion-deep-2250720/
"Fungus Forest Mushroom" by HeyouRelax [CC0] (cropped) via Pixabay https://pixabay.com/photos/fungus-forest-mushroom-wild-2158028/
"leafy, background" by Leon Brooks [Public Domain] (cropped) via Pixnio https://pixnio.com/nature-landscapes/leaf-leaves/leafy-background
"Euglena Microorganisms Nutrition" by ep793 [CC0] (cropped) via Pixabay https://pixabay.com/illustrations/euglena-microorganisms-nutrition-2320760/
"Halobacteria" by NASA [Public Domain] (cropped) via Wikimedia Commons https://ca.m.wikipedia.org/wiki/Fitxer:Halobacteria.jpg
"Under a very high magnification of 20000X, this colorized scanning electron micrograph (SEM) revealed the presence of a single Gram-negative" by CDC/ Bette Jensen [Public Domain] (cropped) via Public Domain Files http://www.publicdomainfiles.com/show_file.php?id=13489041618725

protein
"Cut Icon Infographic Metal" by OpenClipart-Vectors [CC0] (recolored) via Pixabay https://pixabay.com/vectors/cut-icon-infographic-metal-scissors-1297554/
"Wheelbarrow Tools Gardening" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/wheelbarrow-tools-gardening-red-2029732/
"Construction Spanner Tool" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/construction-spanner-tool-wrench-1296235/

protist/Protista
"Turtle Tortoise Sea" by kormandallas [CC0] (cropped) via Pixabay https://pixabay.com/photos/turtle-tortoise-sea-immersion-deep-2250720/
"Fungus Forest Mushroom" by HeyouRelax [CC0] (cropped) via Pixabay https://pixabay.com/photos/fungus-forest-mushroom-wild-2158028/
"leafy, background" by Leon Brooks [Public Domain] (cropped) via Pixnio https://pixnio.com/nature-landscapes/leaf-leaves/leafy-background
"Euglena Microorganisms Nutrition" by ep793 [CC0] (cropped) via Pixabay https://pixabay.com/illustrations/euglena-microorganisms-nutrition-2320760/
"Halobacteria" by NASA [Public Domain] (cropped) via Wikimedia Commons https://ca.m.wikipedia.org/wiki/Fitxer:Halobacteria.jpg
"Under a very high magnification of 20000X, this colorized scanning electron micrograph (SEM) revealed the presence of a single Gram-negative" by CDC/ Bette Jensen [Public Domain] (cropped) via Public Domain Files http://www.publicdomainfiles.com/show_file.php?id=13489041618725
"Soil Earth Excavation" by OpenClipart-Vectors [CC0] (recolored and cropped) via Pixabay https://pixabay.com/vectors/soil-earth-excavation-exposed-575643/
"Protozoan Microbes Biology" by dbutlerdidit [CC0] (no alterations) via Pixabay https://pixabay.com/illustrations/protozoans-microbes-biology-science-1450090/
"Chondrus crispus - Köhler–s Medizinal-Pflanzen-034" by Franz Eugen Köhler, Köhler's Medizinal-Pflanzen [Public Domain] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Chondrus_crispus_-_K%C3%B6hler%E2%80%93s_Medizinal-Pflanzen-034.jpg

radiant/solar energy
"Zelkova Serrata Tree Bonsai" by Deedster [CC0] (cropped and rotated) via Pixabay https://pixabay.com/en/zelkova-serrata-tree-bonsai-zelkova-1613784/
"Pond Water Outdoor" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/pond-water-outdoor-grass-outdoors-310149/
"Illustration depicting the overturning circulation of the global ocean." by NASA/JPL [Public Domain] (no alterations) via NASA Jet Propulsion Laboratory https://www.jpl.nasa.gov/news/news.php?release=2010-101
"Wind Energy Renewable" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/wind-energy-renewable-energy-wind-2029621/
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/hot-temperature-thermometer-weather-159386/

reactant
"Baking Soda Box White" by evitaochel [CC0] (cropped and brightened) via Pixabay https://pixabay.com/photos/baking-soda-box-white-powder-768950/
"Vinegar Cleaning Cleaner" by evitochel [CC0] (cropped) via Pixabay https://pixabay.com/photos/vinegar-cleaning-cleaner-clean-768948/
"Baking Soda and Vinegar" by Stephen Fleenor (cropped)

recessive
"Brown Eye Eyelash" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/brown-eye-eyelash-optic-optical-2027395/
"Blue Eye Eyelash" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/blue-eye-eyelash-optic-optical-2027392/

recombination
This image was created solely by Stephen Fleenor, PhD (Seidlitz Education)

regulation
"Wheel Valve Heating" by Tama66 [CC0] (cropped) via Pixabay https://pixabay.com/photos/wheel-valve-heating-line-turn-2137043/

reproduce/reproduction
"Baby Babyhood Childhood" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/baby-babyhood-childhood-cradle-2023174/
"Male Toilet Public" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/male-toilet-public-bathroom-44078/
"Female Girl Symbol" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/female-girl-symbol-toilet-bathroom-297734/

reproductive success
"Zelkova Serrata Tree Bonsai" by Deedster [CC0] (cropped, rotated and brightened) via Pixabay https://pixabay.com/en/zelkova-serrata-tree-bonsai-zelkova-1613784/
"Seedling Seed Growth" by REDQUASAR [CC0] (no alterations) via Pixabay https://pixabay.com/illustrations/seedling-seed-growth-plant-green-2163773/
"Park Acorns Oak" by pasja1000 [CC0] (croppped) via Pixabay https://pixabay.com/photos/park-acorns-oak-foliage-plant-3682796/
"Leaves Green Nature Oak Acorns Forest Tree" by unknown [CC0] (cropped) via Max Pixel https://www.maxpixel.net/Leaves-Green-Nature-Oak-Acorns-Forest-Tree-2672797

reproductive system
"Reproduction Impregnation" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/reproduction-impregnation-150566/
"Reproductive System" by Siyavula Education [CC BY 2.0] (labels removed) via Flickr https://www.flickr.com/photos/121935927@N06/13578806453

resistance (biological)
"Human body silhouette" by Mikael Häggström [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Human_body_silhouette.svg
"bacteria illness bacterium infection" by Unknown [CC0] (recolored) via SVG Silh https://svgsilh.com/image/156869.html
"Medicine Bottle Pills" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/medicine-bottle-pills-medication-297778/

resource
"Drops of water liquid" by unknown [CC0] (cropped) via Pixabay https://pixabay.com/en/drops-of-water-water-liquid-fresh-578897/
"Húsafell Stone" by Pudpon [CC0 1.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:H%C3%BAsafell_Stone.png
"Barrel Container Oil" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/barrel-container-oil-metal-drum-36724/
"Pond Water Outdoor" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/pond-water-outdoor-grass-outdoors-310149/
"Association Community Group" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/association-community-group-meeting-152746/

respiratory system
"Human body silhouette" by Mikael Häggström [Public Domain] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Human_body_silhouette.svg
"Anatomy Lungs Breathing" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/anatomy-lungs-breathing-human-145696/

response
"Plant" by gsagri04 [Public Domain] (cropped and rotated) via Free Stock Photos http://www.freestockphotos.biz/stockphoto/15474
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/en/hot-temperature-thermometer-weather-159386/
"Beauty Face Girl" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/beauty-face-girl-head-portrait-1299249/
"Lamp Light Table" by simisi1 [CC0] (no alterations) via Pixabay https://pixabay.com/en/lamp-light-table-vector-2561267/

ribosome
"Icons Information Rodentia" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/icons-information-rodentia-icons-1294597/

RNA (ribonucleic acid)
"Icons Information Rodentia" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/icons-information-rodentia-icons-1294597/
"ribosome" by redondoself [CC BY 2.0] (cropped) via Flickr https://www.flickr.com/photos/redondoself/3902609089

RNA virus/retrovirus
"DNA mutation" by Mouagip [Public Domain] (recolored, cropped and labels removed) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:DNA_UV_mutation.svg

root/roots
"Stem Leaves Paris Parts Plant" by Unknown [CC0] (no alterations) via Max Pixel https://www.maxpixel.net/Stem-Leaves-Paris-Plants-Leaf-2082612
"Rg1024 Set of water drops" by rg1024 [CC0 1.0] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Rg1024_Set_of_water_drops.svg
"Dicotyledoneae Asteraceae herb - root system, primary root becomes tap root and lateral roots" by RoRo [CC0 1.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Dicotyledoneae_Asteraceae_herb_-_root_system,_primary_root_becomes_tap_root_and_lateral_roots.JPG

secondary consumer
"Marine food web" by Siyavula Education [CC BY 2.0] (no alterations) via Flickr https://www.flickr.com/photos/121935927@N06/13578843423
"Checkmark green" by Nobbler 76 [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Checkmark_green.svg

secondary succession
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/
"Grass Meadow Green" by OpenClipart-Vectors [CC0] (recolored) via Pixabay https://pixabay.com/vectors/grass-meadow-green-agriculture-159804/
"Fire Flames Hell" by Clker-Free-Vector-Images [CC0] (stretched and rotated) via Pixabay https://pixabay.com/vectors/fire-flames-hell-burn-bright-307336/

semi‐permeable
"Kidney Beans Leguminous Plants" by OpenClipart-Vectors [CC0] (cropped and rotated) via Pixabay https://pixabay.com/vectors/kidney-beans-leguminous-plants-161837/
"Basketball Ball Nba" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/basketball-ball-nba-sport-147794/
"Delete No Access Denied Road" by OpenClipart-Vectors [CC0] (rotated) via Pixabay https://pixabay.com/vectors/delete-no-access-denied-road-sign-146891/
"Fence Iron Mesh Wire" by susannp4 [CC0] (rotated) via Pixabay https://pixabay.com/illustrations/fence-iron-fence-mesh-wire-mesh-1094920/

sequence
This image was created solely by Stephen Fleenor, PhD (Seidlitz Education)

shoot system
"Stem Leaves Paris Parts Plant" by Unknown [CC0] (no alterations) via Max Pixel https://www.maxpixel.net/Stem-Leaves-Paris-Plants-Leaf-2082612
"Dicotyledoneae Asteraceae herb - root system, primary root becomes tap root and lateral roots" by RoRo [CC0 1.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Dicotyledoneae_Asteraceae_herb_-_root_system,_primary_root_becomes_tap_root_and_lateral_roots.JPG

skeletal system
"Human skeleton back no-text no-color" by LadyOfHats/Mariana Ruiz Villareal [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Human_skeleton_back_no-text_no-color.svg
"Human skeleton front no-text no-color" by LadyOfHats/Mariana Ruiz Villareal [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Human_skeleton_front_no-text_no-color.svg

somatic cell
"Human body silhouette" by Mikael Häggström [Public Domain] (recolored and cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Human_body_silhouette.svg
"Neuron Nerve Cell Axon" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/neuron-nerve-cell-axon-dendrite-296581/
"Reproduction Impregnation" by OpenClipart-Vectors [CC0] (cropped) via Pixabay https://pixabay.com/vectors/reproduction-impregnation-150566/

species
"Amurtiger Tiger Big Cat" by Pixel-mixer [CC0] (cropped) via Pixabay https://pixabay.com/photos/amurtiger-tiger-big-cat-siberian-1975790/
"Puppy Labradoodle Pal" by slipschutz [CC0] (cropped) via Pixabay https://pixabay.com/photos/puppy-labradoodle-pal-friend-dog-5010561/
"Dog, Black Standard Poodle" by Karen Arnold [CC0 Public Domain] (cropped) via PublicDomainPictures https://www.publicdomainpictures.net/en/view-image.php?image=242148&picture=dog-black-standard-poodle
"Labrador Dog Outdoor" by stanze [CC0] (cropped) via Pixabay https://pixabay.com/photos/labrador-dog-outdoor-view-portrait-2121759/
"Cat Kitten Sit" by DarkWorkX [CC0] (cropped) via Pixabay https://pixabay.com/photos/cat-kitten-sit-isolated-red-white-2669554/

spindle fiber
This image was created solely by Stephen Fleenor, PhD (Seidlitz Education)

stability/stable
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/

stasis
"Soil Earth Excavation" by OpenClipart-Vectors [CC0] (recolored and cropped) via Pixabay https://pixabay.com/vectors/soil-earth-excavation-exposed-575643/
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/
"Horseshoe Crab Marine Life Ocean" by Pexels [CC0] (cropped) via Pixabay https://pixabay.com/photos/horseshoe-crab-marine-life-ocean-1869338/
"Horseshoe Crab Limulidae Fossil" by TheUjulala [CC0] (cropped and recolored) via Pixabay https://pixabay.com/photos/horseshoe-crabs-limulidae-fossil-1169323/

stem
"Stem Leaves Paris Parts Plant" by Unknown [CC0] (no alterations) via Max Pixel https://www.maxpixel.net/Stem-Leaves-Paris-Plants-Leaf-2082612
"Dicotyledoneae Asteraceae herb - root system, primary root becomes tap root and lateral roots" by RoRo [CC0 1.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Dicotyledoneae_Asteraceae_herb_-_root_system,_primary_root_becomes_tap_root_and_lateral_roots.JPG

stimulus/stimuli
"Plant" by gsagri04 [Public Domain] (cropped and rotated) via Free Stock Photos http://www.freestockphotos.biz/stockphoto/15474
"Hot Temperature Thermometer" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/en/hot-temperature-thermometer-weather-159386/
"Beauty Face Girl" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/beauty-face-girl-head-portrait-1299249/
"Lamp Light Table" by simisi1 [CC0] (no alterations) via Pixabay https://pixabay.com/en/lamp-light-table-vector-2561267/

stoma/stomata
"Stem Leaves Paris Parts Plant" by Unknown [CC0] (no alterations) via Max Pixel https://www.maxpixel.net/Stem-Leaves-Paris-Plants-Leaf-2082612
"Rg1024 Set of water drops" by rg1024 [CC0 1.0] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Rg1024_Set_of_water_drops.svg
"Tomato leaf stomate 1-color" by Photohound [Public Domain] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Tomato_leaf_stomate_1-color.jpg

substrate
This image was created solely by Stephen Fleenor, PhD (Seidlitz Education)

survive/survival
"Dead mouse" by Madprime [CC0 1.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Dead_mouse.svg
"Mouse" by Madprime (assumed) [CC0 1.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Mouse.svg
"Checkmark green" by Nobbler 76 [Public Domain] (no alterations) via Wikimedia Commons https://en.wikipedia.org/wiki/File:Checkmark_green.svg

symbiosis/symbiotic relationship
"EscherichiaColi NIAID" by Rocky Mountain Laboratories, NIAID, NIH [Public Domain] (recolored) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:EscherichiaColi_NIAID.jpg
"Human body silhouette" by Mikael Häggström [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Human_body_silhouette.svg
"Cougar Mountain Lion" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/cougar-mountain-lion-wild-animal-47667/
"Rabbit Silhouette Black Isolated" by Gorkhs [CC0] (recolored) via Pixabay https://pixabay.com/en/rabbit-silhouette-black-2262101/
"Remora and shark" by Brian Snelson [CC BY 2.0] (no alterations) via Flickr https://www.flickr.com/photos/exfordy/2950573720

synthesis
Untitled by Unknown [CC0 1.0] (no alterations) via Pxhere https://pxhere.com/en/photo/1175223

taxon/taxa/taxonomic group
This image was created solely by Stephen Fleenor, PhD (Seidlitz Education)

terrestrial
"Soil Earth Excavation" by OpenClipart-Vectors [CC0] (recolored and cropped) via Pixabay https://pixabay.com/vectors/soil-earth-excavation-exposed-575643/
"Mushroom Cartoon Fungus" by basker_Dhandapani [CC0] (no alterations) via Pixabay https://pixabay.com/illustrations/mushroom-cartoon-fungus-vegetable-2844146/
"Zelkova Serrata Tree Bonsai" by Deedster [CC0] (cropped and rotated) via Pixabay https://pixabay.com/en/zelkova-serrata-tree-bonsai-zelkova-1613784/
"Bird Silhouette Flying" by Elionas [CC0] (no alterations) via Pixabay https://pixabay.com/en/bird-silhouette-flying-movement-1314469/
"Deer Male Animal" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/deer-male-animal-mammal-antlers-48417/
"bacteria illness bacterium infection" by Unknown [CC0] (recolored) via SVG Silh https://svgsilh.com/image/156869.html
"Worm Earthworm Nightcrawler" by Clker-Free-Vector-Images [CC0] (rotated) via Pixabay https://pixabay.com/vectors/worm-earthworm-nightcrawler-37662/
"Hornet Wasp Insect" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/hornet-wasp-insect-bee-brown-151003/

tertiary consumer
"Marine food web" by Siyavula Education [CC BY 2.0] (no alterations) via Flickr https://www.flickr.com/photos/121935927@N06/13578843423
"Checkmark green" by Nobbler 76 [Public Domain] (no alterations) via Wikimedia Commons https://en.wikipedia.org/wiki/File:Checkmark_green.svg

thigmotropism
"Vine" by Jon Sullivan [Public Domain] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Vine.jpg
"Fly Housefly Macro Close" by TBIT [CC0] (background removed) via Pixabay https://pixabay.com/photos/fly-housefly-macro-close-up-insect-946712/
"Venus Fly Trap Carnivorous" by jemmaliggett13 [CC0] (cropped) via Pixabay https://pixabay.com/photos/venus-fly-trap-fly-carnivorous-4606879/
"Insect Venus Fly Trap" by Isbbohn [CC0] (cropped) via Pixabay https://pixabay.com/photos/insect-venus-fly-trap-plant-1535990/

tissue
"Digestive system without labels" by LadyOfHats [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Digestive_system_without_labels.svg
"Muscle Tissue: Smooth" by Berkshire Community College Bioscience Image Library [CC0 1.0] (cropped) via Flickr https://www.flickr.com/photos/146824358@N03/40087100490/
"Stomach Muscles Muscle Layers" by LillyCantabile [CC0] (no alterations) via Pixabay https://pixabay.com/illustrations/stomach-muscles-muscle-layers-3329346/
"magnification, 500x, hematoxyllin, eosin, lung, tissue, sample" by Dr. Brachman, USCDCP [Public Domain] (cropped) via Pixnio https://pixnio.com/science/microscopy-images/plague-yersenia-pestis/magnification-of-500x-this-hematoxylin-and-eosin-stained-he-lung-tissue-sample

trait
"Dog Pet Hovawart" by Chiemsee2016 [CC0] (cropped) via Pixabay https://pixabay.com/photos/dog-pet-hovawart-black-1194087/
"Husky Dog Breed" by pixel2013 [CC0] (cropped) via Pixabay https://pixabay.com/photos/husky-dog-dog-breed-animal-3380548/
"Dog Animal Portrait" by Vizsalafotozas [CC0] (cropped) via Pixabay https://pixabay.com/photos/dog-animal-portrait-pet-brown-3277416/

transcription
This image was created solely by Stephen Fleenor, PhD (Seidlitz Education)

translation
This image was created solely by Stephen Fleenor, PhD (Seidlitz Education)

transpiration
"Stem Leaves Paris Parts Plant" by Unknown [CC0] (no alterations) via Max Pixel https://www.maxpixel.net/Stem-Leaves-Paris-Plants-Leaf-2082612
"Rg1024 Set of water drops" by rg1024 [CC0 1.0] via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Rg1024_Set_of_water_drops.svg

transport
"Truck Delivery Box Vehicle Car Transport Shipping" by Unknown [CC0] (cropped and recolored) via Max Pixel https://www.maxpixel.net/Truck-Delivery-Box-Vehicle-Car-Transport-Shipping-2181037
"Fruits Vegetables Artichoke" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/fruits-vegetables-artichoke-banana-155616/
"Soil Eart Poo" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/soil-eart-poo-brown-dirt-heap-576296/
"Airmail Envelope Back View" by Karen Arnold [CC0] (rotated) via PublicDomainPictures https://www.publicdomainpictures.net/en/view-image.php?image=42544&picture=airmail-envelope-back-view

tRNA
"Traffic Sign Road Shield" by CopyrightFreePictures [CC0] (no alterations) via Pixabay https://pixabay.com/illustrations/traffic-sign-road-sign-shield-6627/

trophic level
"bacterium h bacterium" by Unknown [CC0] (no alterations) via SVG Silh https://svgsilh.com/image/1455818.html
"bacteria illness bacterium infection" by Unknown [CC0] (no alterations) via SVG Silh https://svgsilh.com/image/156869.html
"Mushroom Cartoon Fungus" by basker_Dhandapani [CC0] (no alterations) via Pixabay https://pixabay.com/illustrations/mushroom-cartoon-fungus-vegetable-2844146/
"Biodiversity Earthworm Fertilizer" by OpenClipart-Vectors [CC0] (rotated) via Pixabay https://pixabay.com/vectors/biodiversity-earthworm-fertilizer-160380/
"Caterpillar Monarch Butterfly" by OpenClipart-Vectors [CC0] (rotated) via Pixabay https://pixabay.com/en/caterpillar-monarch-butterfly-156937/
"Cougar Mountain Lion" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/cougar-mountain-lion-wild-animal-47667/
"Bird" by yves_guillou (OCAL) [Public Domain] (no alterations) via Free Stock Photos http://www.freestockphotos.biz/stockphoto/15184
"Zelkova Serrata Tree Bonsai" by Deedster [CC0] (cropped and rotated) via Pixabay https://pixabay.com/en/zelkova-serrata-tree-bonsai-zelkova-1613784/
"Dandelion Flower Yellow" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/en/dandelion-flower-yellow-plant-weed-31406/
"Animal Bear Brown" by OpenClipart-Vectors [CC0] (rotated) via Pixabay https://pixabay.com/vectors/animal-bear-brown-cub-cute-hairy-160462/
"Rabbit Silhouette Black Isolated" by Gorkhs [CC0] (no alterations) via Pixabay https://pixabay.com/en/rabbit-silhouette-black-2262101/

uracil
"DNA mutation" by Mouagip [Public Domain] (recolored, cropped and labels removed) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:DNA_UV_mutation.svg

vaccine
"Human body silhouette" by Mikael Häggström [Public Domain] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Human_body_silhouette.svg
"Syringe Doctor Needle Disposable" by janjf93 [CC0] (background color removed) via Pixabay https://pixabay.com/vectors/syringe-doctor-needle-1597515/

vacuole
"Turgor pressure on plant cells diagram" by LadyofHats [Public Domain] (labels removed) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Turgor_pressure_on_plant_cells_diagram.svg
"Rg1024 Set of water drops" by rg1024 [CC0 1.0] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Rg1024_Set_of_water_drops.svg

variation
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/
"Mouse Rodent Rat" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/mouse-rodent-rat-black-cute-296396/
"Gerbil Mouse Rodent" by Clker-Free-Vector-Images [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/gerbil-mouse-rodent-brown-animal-303178/
"DNA mutation" by Mouagip [Public Domain] (recolored, cropped and labels removed) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:DNA_UV_mutation.svg

vasculature
"Stem Leaves Paris Parts Plant" by Unknown [CC0] (no alterations) via Max Pixel https://www.maxpixel.net/Stem-Leaves-Paris-Plants-Leaf-2082612
"Circulatory System no tags" by LadyofHats [Public Domain] (no alterations) via Wikimedia Commons https://zh-yue.wikipedia.org/wiki/File:Circulatory_System_no_tags.svg
"Dicotyledoneae Asteraceae herb - root system, primary root becomes tap root and lateral roots" by RoRo [CC0 1.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Dicotyledoneae_Asteraceae_herb_-_root_system,_primary_root_becomes_tap_root_and_lateral_roots.JPG

vesicle
"Liposome cross section flopped" by Philcha [CC0 1.0] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Liposome_cross_section_flopped.png

vestigial structure
"Calendar Schedule Day" by vectorstall [CC0] (rotated and text removed) via Pixabay https://pixabay.com/vectors/calendar-schedule-day-diary-2872749/
"Whale legs" by TimVickers [CC BY-SA 3.0] (no alterations) via Wikimedia Commons https://en.wikipedia.org/wiki/File:Whale_legs.png
"Pakicetus BW" by Nobu Tamura (http://spinops.blogspot.com) [CC BY 3.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Pakicetus_BW.jpg
"Ambulocetus BW" by Nobu Tamura (http://spinops.blogspot.com) [CC BY 3.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Ambulocetus_BW.jpg
"Dolphin Marine Mammals Animals" by Gellinger [CC0] (cropped and rotated) via Pixabay https://pixabay.com/photos/dolphin-marine-mammals-animals-sea-475649/

virus
"Virus Bacteriophage Biology" by OpenClipart-Vectors [CC0] (brightened) via Pixabay https://pixabay.com/vectors/virus-bacteriophage-biology-disease-149183/
"DNA mutation" by Mouagip [Public Domain] (recolored, cropped and labels removed) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:DNA_UV_mutation.svg
"Cigar Cigarette Flora" by OpenClipart-Vectors [CC0] (no alterations) via Pixabay https://pixabay.com/vectors/cigar-cigarette-flora-flower-2028274/
"TMV structure simple" by Thomas Splettstoesser [CC BY-SA 3.0] (labels removed) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:TMV_structure_simple.png

xylem
"Stem Leaves Paris Parts Plant" by Unknown [CC0] (no alterations) via Max Pixel https://www.maxpixel.net/Stem-Leaves-Paris-Plants-Leaf-2082612
"Dicotyledoneae Asteraceae herb - root system, primary root becomes tap root and lateral roots" by RoRo [CC0 1.0] (no alterations) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Dicotyledoneae_Asteraceae_herb_-_root_system,_primary_root_becomes_tap_root_and_lateral_roots.JPG
"Rg1024 Set of water drops" by rg1024 [CC0 1.0] (cropped) via Wikimedia Commons https://commons.wikimedia.org/wiki/File:Rg1024_Set_of_water_drops.svg









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