Because a energy pyramid takes the shape of a pyramid.
<h2>Explanation:</h2>
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.
