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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.
Pyramids of biomass usually are a true pyramid shape (each level is smaller than the one below it). The biomass in each trophic level is always less than the trophic level below. This is because biomass is a measure of the amount of food available.