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A pyramid is bigger at the bottom and small and pointy at the top. so its bigger at the bottom, otherwise it would have been called an energy upside-down pyramid =).

But anyway,

energy enters a food chain from the sun. some energy and biomass is lost at each stage of a food chain as feaces, movement energy and heat energy (especiall birds and mammals). therefore only a small amount of energy and biomass is incorporated into a consumer's body and transferred to the next feeding level.

the loss of energy and biomass at each stage is a representation of why the pyramid gets smaller at the top.

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14y ago

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