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| scientific study of interactions between organisms and their environments. |
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| portion of earth that supports life |
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| group of organism that can interbreed and produce fertile offspring in nature |
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| group of organisms all of the same species which interbreed and live in the same place at the same time |
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| collection of several interacting populations that inhabit a common environment |
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| interactions among populations in a community |
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| group of ecosystems with the same climax communities |
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| organisms that use energy from the sun or energy stored in chemical compounds to manufacture their own nutrients |
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| organisms that cannot make their own food |
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| organisms that represent a feeding step in the movement of energy and materials through an ecosystem |
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| the total mass or weight of all living matter in a given area |
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| an organisms role in its enviroment |
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