The size of a food chain can vary, but the number of levels that a food chain can reach is limited.Why does this limit exist?

Only some of the energy at one trophic level is passed on to the next; much is used for life processes or lost as heat. As a result, less energy is available at each higher level, limiting how many levels a food chain can support. “Energy is lost at each trophic level” is the correct choice.

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