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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.
A bird nesting in a tree is an example of commensalism. A bird nesting in a tree is an example of commensalism. The definition of commensalism is a relationship between two organisms where one is helped and the other is unaffected.