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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.
In commensalism, the symbiont benefits from the host, while the host is unaffected. Some plants, such as orchids and moss, will grow out of large trees to gain easy access to sunlight. They neither help nor harm their host tree.eutralism is when a symbiont and a host have no effect on each other. It is practically impossible to confirm or find in nature because all organisms living together have some kind of impact on each other.