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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.
Ammensalism is an interaction where an organism inflicts harm to another organism without any costs or benefits received by the other. A clear case of ammensalism is where sheep or cattle trample grass.iological interactions are the effects that the organisms in a community have on one another.