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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.
Mutualism is a relationship between two species in which both benefit. For example, a cleaner fish and a gouper(i think thats what its called). And a bee and a flower. Commensalism is a relationship between two species one is benefit and the other is nor benefited nor harmed.For example, a bird living in a tree. Parasitism is a relationship between two species one is benefit the other is harmed. For example, human and a mosquito.