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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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