bears eat berries, humans, and large fish; large fish eat smaller fish and insects;?

Yaowei

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bears eat berries, humans, and large fish; large fish eat smaller fish and insects; humans eat bears, large fish, and berries; venus flytraps eat insects. the scenario described here is an example of____

a. apopulation histogram
b. parasitism
c. an ecosystem
d. a food web.
 
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