A food chain links trophic levels together and denotes movement of energy from plant compounds to organisms that eat plants, then to other organisms that eat the plant feeders, and on and on. This differs from a food web, which shows the branching pathways for transfer of energy and materials among species in an ecosystem.
Work Step by Step
A food chain links the levels together in a single line, showing the movement of energy from plants upward. A food web shows branching pathways for the transfer of energy in an ecosystem.