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1. A term used to describe the mutually beneficial relationship between two organisms living together, such as a lichen.
2. The close biological relationships between two or more organisms. Symbiosis may be categorised as:
a) Mutualism; which is beneficial to all the organisms involved, and is typical of many applications of symbiosis;
b) Commensalism; which is beneficial to one organism, but without any particular negative or positive effect on the other organism/s;
c) Parasitism; which is beneficial to one organism and detrimental to the other/s.