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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.
Three types: a) Commensalism b) Mutualism c) Parasitism .Symbiosis 1. Examples: a) Barnacles living on whaleÂ·s body and crab b) BirdÂ·s nest fern living on tree branches c) Remora fish attaches at sharkÂ·s body . 2.Commensalism 1. Two organism interact but only one gets benefit and the other does not gain anything.