Food chain

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1. a sequence of organisms in a community in which each member of the chain feeds on the member below it, as in fox, rabbit and grass.

food%20chain.JPG

This photo of a food chain shows the feeding relationships in a community that are represented as organisms occupying different trophic levels. A food chain is simply "who eats what".
Source: http://www.csus.edu/indiv/l/loom/nov18%20f05.htm