A diagram of the flow of energy through an ecosystem resembles a pyramid. This explains why

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The pyramid shape of energy flow in an ecosystem illustrates that as energy moves up the trophic levels from producers to primary consumers to secondary consumers, there is a decrease in energy available. This results in larger populations of organisms at the base (e.g., grass) than at the top (e.g., lions), because less energy is available to support organisms at higher trophic levels.

A Diagram of the Flow of Energy Through an Ecosystem