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not one ... many online XD
photosynthesis, the process by which green plants and certain other organisms transform light energy into chemical energy.
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Lymphocyte ︎ ︎ ︎ ︎ ︎ ︎ ︎ ︎ ︎ ︎ ︎ ︎
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Cell membrane allows some material to pass through it while on the same time it blocks other material from entering through it
Cells, tree, digestive system, public transportation system, government systems, school systems, families, dog, forest, pond, prairie, communication systems, towns, insect, solar system, weather systems, bird, correctional system, squirrel, soil, etc.