Question

hi..............................m

Answer 1

Hey..!!!
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The energy from the sun flows into autotrophs and it passes to herbivores and then to carnivores.

The energy does not revert from autotrophs to the solar input or from herbivores back to autotrophs.Hence the flow is unidirectional.

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I Hope It's help you..!!!

Answer 2

It never comes back as the flow of energy is unidirectional so once it passes through the trophic level never returns again