Biology / Bio 0064 · Atom · ~20 seconds
Levels of Organization: Population to Biosphere
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Organisms of one species form a population; populations in an area form a community; a community plus surroundings forms an ecosystem; ecosystems together form the biosphere.
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Every pine tree in a forest is one population; its insects and plants sharing the area form the community.
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A community includes only living populations; an ecosystem adds nonliving surroundings, like soil and rainfall, on top.
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