Food chain: Ecological pyramids simplify the complex interactions of an ecosystem by typically representing a simple, linear food chain where energy and nutrients move from producers to top consumers.

Food web: While pyramids often assume a simple food chain, they are visual models that describe the feeding relationships and trophic structure found within a broader food web.

Energy flow: This is the most critical foundation. Pyramids (especially energy pyramids) illustrate how energy is transferred and progressively lost (the 10% rule) as it flows from the base (producers) to the apex (top predators).

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