In biological terms, _______ is a relationship between two organisms in which one organism benefits and the other is unaffected.

Commensalism

The correct answer is Option (2) -Commensalism

In biological terms, the relationship between two organisms in which one organism benefits and the other is unaffected is:Commensalism

Commensalism is a type of symbiotic relationship where one organism, known as the commensal, benefits from the association, while the other organism, known as the host, is neither helped nor harmed. In this relationship, the commensal organism may use the host organism for resources, shelter, transportation, or other benefits, but it does not negatively impact the host. Commensalism is a common ecological interaction observed in nature, where one organism takes advantage of the presence of another organism without causing harm.