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ectosymbiosis

n. (context biology English) A form of symbiosis in which a partner (the ''ectosymbiont'') remains on the surface of its host

Wikipedia
Ectosymbiosis

Ectosymbiosis is symbiosis in which the symbiont lives on the body surface of the host, including internal surfaces such as the lining of the digestive tube and the ducts of glands.

Category:Symbiosis