An Introduction to Evolution

By Laura Klappenbach, About.com Guide

Coevolution is the evolution of two or more groups of organisms together, each in response to the other. In a coevolutionary relationship, changes experienced by each individual group of organisms is in some manner shaped by or influenced by the other groups of organisms in that relationship.

The relationship between flowering plants and their pollinators can offer a classic examples of coevolutionary relationships. Flowering plants rely on pollinotors to transport pollen among indivudla plants and thus enable cross-pollination.