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Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now! https://www.khanacademy.org/science/hs-bio/x230b3ff252126bb6:ecology-and-natural-systems/x230b3ff252126bb6:organization-of-natural-systems/v/ecosystems-and-biomes Ecosystems, made up of living and non-living things, can be as small as a tide pool or ...
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