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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.
An example of commensalism is when a bird lives in a tree; the bird is helped by living in the tree because it has a place to build its nest and it is high up so protected from predators, but the tree is not affected.