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In an estuary a zooplankton consumes a phytoplankton with a small globule of pcbs attached to it. a fish consumes the zooplankton as well as many other zooplankton. a larger fish consumes the small fish and then a gull consumes the larger fish. the increased concentration of the chemical at the top of the food chain is an example of

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zebrius
This is an example of biomagnification or else bioamplification. This term describes the increasing concentration of a substance in the tissues of organisms at the top of the food chain. These substances are often toxic chemicals, pesticides or heavy metals and are called bioaccumulants. 

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