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Symbiosis occurs when two organisms create a union in which each is benefited by the other.
Coral lives a symbiotic life. The algae gives off oxygen and other nutrients that the coral polyp needs to live and in return the polyp gives the algae carbon dioxide and other substances the algae needs. Fish with troublesome parasites allow other fish to pick off the parasites. The parasitic fish get rid of the nasty bugs and the helper fish get a free meal. Certain fish are immune to the sting of the jellyfish.