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| A food chain is a series of steps in which organisms transfer energy by eating and being eaten. |
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| In some aquatic food chains, primary producers are a mixture of floating algae called phytoplankton. |
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| A food web is a network of complex interactions formed by the feeding relationships among the various organisms in an ecosystem. |
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| Zooplankton are Small free-floating animals that form part of a plankton. |
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| Each step in a food chain or food web is called a trophic level. |
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| Ecological pyramids show the relative amount of energy or matter contained within each trophic level in a given food chain or food web. |
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| Amount of living tissue within a given trophic level is called its biomass. |
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