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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.
The biotic components of an ecosystem are classified into three levels: producers, consumers, and decomposers. An energy pyramid is a model that shows the flow of energy from one trophic, or feeding, level to the next in an ecosystem.The model is a diagram that compares the energy used by organisms at each trophic level.The energy in an energy pyramid is measured in units of kilocalories (kcal).nergy pyramids such as this help to explain the trophic structure of an ecosystem: the number of consumer trophic levels that can be supported is dependent on the size and energy richness of the producer level.