Ectosymbiosis vs. Endosymbiosis

Ectosymbiosisnoun

(ecology) A form of symbiosis in which a partner (the ectosymbiont) remains on the surface of its host

Ectosymbiosis

Ectosymbiosis is a form of symbiotic behavior in which a parasite lives on the body surface of the host, including internal surfaces such as the lining of the digestive tube and the ducts of glands. The parasitic species is generally an immobile, or sessile, organism existing off of biotic substrate through mutualism, commensalism, or parasitism.

Endosymbiosisnoun

(ecology) The condition of living within the body or cells of another organism; an instance of an organism so living.