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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.
Hedonism is a school of thought that argues that pleasure is the primary or most important intrinsic good. In very simple terms, a hedonist strives to maximize net pleasure (pleasure minus pain).