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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.
â¢ Parasitism: a relationship in which one species benefits while the other is harmed. â¢ Commensalism: a relationship in which one species benefits but the other species is neither harmed nor helped. We often represent mutualism with a â+/+â because both species receive a posi - tive benefit. Commensalism is shown as a â+/0â relationship because one species