symbiosis

The close, often mutually beneficial, association between two or more organisms of different species. The association of algae and fungi in lichens and of bacteria living in the intestines are forms of symbiosis.

Citation: 
Modified from: symbiosis. (n.d.) The American Heritage® Science Dictionary. (2005). Retrieved August 26 2014 from http://www.thefreedictionary.com/symbiosis
English

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