The Euphotic Zone
Parasitism, Mutualism, Coevolution
Parasitism is a symbiotic interaction in which one organism, the parasite,
derives its nourishment from another organism, its host, which is harmed in the process.
Mutual symbiosis, or mutualism, is an interspecific interaction that benefits both species.
Coevolution refers to reciprocal evolutionary adaptions of two interacting species.