* An energy pyramid and a food chain both show the flow of energy through an ecosystem.
* They both start with the sun as the primary source of energy.
* They both show how energy is passed from one organism to another.
* They both show how energy is lost as it moves up the food chain or energy pyramid.
Differences
* An energy pyramid shows the amount of energy at each trophic level, while a food chain shows the sequence of organisms that eat each other.
* An energy pyramid is a quantitative representation of the energy flow, while a food chain is a qualitative representation of the energy flow.
* An energy pyramid can be used to compare different ecosystems, while a food chain can be used to track the flow of energy through a particular ecosystem.