Question

a relationship in which two different organisms live in close association with each other

Explanation:

Symbiosis is defined as a relationship where two different organisms live in close association. Mutualism is a type of symbiosis where both organisms benefit. Commensalism is a symbiotic relationship where one organism benefits and the other is neither helped nor harmed. Parasitism is a symbiotic relationship where one organism (the parasite) benefits at the expense of the other (the host). The question asks for the term that describes the general relationship of two different organisms living in close association, which is symbiosis.

Answer:

symbiosis