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Why are the trophic levels in the shape of a pyramid?

Answer 1

The pyramidale shape of the trophic level come from the loss of energy between the levels.

At the bottom of the chain, The primary productors grow to a certain Biomass level, let's call it X. The primarys consummers will proceed to eat the primary productors but out of the X they will eat only X minus the energy loss will be used to produce new primary cosumers.
And so it goes between each trophic levels

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Answer 2

Cora Andrews

Trophic levels form a pyramid shape due to energy loss as it transfers through each level. Producers capture only a fraction of sunlight, and energy diminishes as it moves to herbivores and then carnivores, resulting in fewer organisms at higher levels.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.