[IB Biology at GHS: Reviews of Ecology]
10. Why do most food chains contain 4-5 trophic levels at most?

A) There isn't enough nutrients left in the chain by the time it gets to the top carnivore.

B) There isn't enough energy left in the chain by the time it gets to the top carnivore.

C) There isn't enough energy left in the chain by the time it gets to the top autotroph.

D) Both answers A and B.

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Slichter