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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 some of these commensalism relationships, the organism that is reaping the benefit will use the other for protection or transportation. 1  Example: A hermit crab taking up residence in an empty seashell. 2  Example: A spider building a web on a tree.