Explain why a pyramid is used to show a food chain.

Because a energy pyramid takes the shape of a pyramid.

Explanation:Energy pyramids shaped the way they are this is because when an energy flow is observered in increasing order it takes a shape of a pyramid and in case for decreasing energy it take the shape of inverted pyramid. An energy pyramid's shape shows how the amount of useful energy that enters each level — chemical energy in the form of food — decreases as it is used by the organisms in that level. That's why energy flow is depicted in the shape of a pyramid.

Result: Pyramids is used to show a food chain.

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