Editing Biological interaction (section)

==== Parasitism ====

{{main|Parasitism}}

Parasitism is a relationship between species, where one organism, the [[parasite]], lives on or in another organism, the [[Host (biology)|host]], causing it some harm, and is [[adaptation (biology)|adapted]] structurally to this way of life.<ref>{{cite book | last=Poulin | first=Robert | author-link=Robert Poulin (zoologist) | title=Evolutionary Ecology of Parasites | publisher=Princeton University Press | year=2007 | isbn=978-0-691-12085-0 | pages=[https://archive.org/details/evolutionaryecol0000poul/page/4 4–5] | url=https://archive.org/details/evolutionaryecol0000poul/page/4 }}</ref> The parasite either feeds on the host, or, in the case of intestinal parasites, consumes some of its food.<ref>{{cite journal |title=Current usage of symbiosis and associated terminology |last1=Martin |first1= Bradford D. |last2= Schwab |first2=Ernest |year=2013 |journal=International Journal of Biology |volume=5 |issue=1 |pages=32–45 |doi=10.5539/ijb.v5n1p32|doi-access=free }}</ref>