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Answers. 1  A food chain is the what animal eats what animal. It really should be called a food web because many animals eat many other animals. The food web is a representation of an energy pyramid. An energy pyramid just shows where the energy is going. The sun is at the bottom, then plants and so on. There really are not many differences between them.
a pyramid shape represents the energy present at each trophic level in a food web because in an ecosystem energy moves from the pro ducers to the various levels of consumers there is less bio mass and available energy at each subsequent level