food chain
US /ˈfuːd ˌtʃeɪn/
UK /ˈfuːd ˌtʃeɪn/
1.
a hierarchical series of organisms each dependent on the next as a source of food
:
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In the ocean food chain, plankton are at the bottom.
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Humans are at the top of the terrestrial food chain.
a hierarchical series of organisms each dependent on the next as a source of food