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Symbiosis is a close, prolonged association between two (or more) organisms of different species that may, but does not necessarily, benefit each member.

The specific biological interactions of symbiosis can be subdivided in three:

* Mutualism, where both organisms benefit. * Commensalism, where only one of them benefits, but the other is not affected. * Parasitism, where one benefits and the other organism is harmed.

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13y ago

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