A symbiotic relationship where both of the co-existing species benefit from the interaction is called c. mutualism.
Mutualism is a symbiotic dating wherein each species benefits. Commensalism is a symbiotic relationship wherein one species benefits whilst the other isn't affected. Parasitism is a symbiotic relationship wherein the parasitic species benefits even as the host species is harmed.
A symbiotic relationship in which a symbiont lives all or part of its existence in or on a living host, usually benefiting at the same time as harming the host in some manner and generally having a better reproductive capability than the host.
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