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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 is the best shape to show how energy moves though an ecosystem because when an animal eats another animal they only get one- tenth of the energy the animal that theyâ¦ ate had. So, every time something is eaten, the percentage of energy keeps getting smaller.