Ecosystems and biomes | Ecology and natural systems | High school biology | Khan Academy 

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Ecosystems, made up of living and non-living things, can be as small as a tide pool or as big as a rainforest. Ecosystems can be classified as terrestrial or aquatic, with aquatic further divided into marine and freshwater. Land ecosystems are often categorized into biomes, such as tropical forests or deserts, based on climate and vegetation.
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