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Commensalism benefits one organism and the other organism is neither benefited nor harmed. It occurs when one organism takes benefits by interacting with another organism by which the host organism is not affected. A good example is a remora living with a shark. Remoras eat leftover food from the shark.
Not all relationships among organisms are competitive; for example, the commensal relationship between members of different species is noncompetitive (see commensalism). The Columbia Electronic Encyclopedia, 6th ed. Copyright Â© 2012, Columbia University Press.