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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.
In parasitism, one organism benefits from the relationship but at the expense of the other. The organism may live inside the otherâs body or on its surface. In some of these parasitic relationships the host dies and in others, it is important that the host remain alive.ommensalism. Commensalism is a type of relationship where one of the organisms benefits greatly from the symbiosis. The other is not helped but is not harmed or damaged from the relationship. In other words, this is a one-sided symbiotic relationship.