A mutualism in which two species must live together and cannot survive when apart is referred to as a(n)

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An obligatory mutualism is a type of mutualistic relationship in which two species are dependent on each other for survival and cannot survive when apart. This is in contrast to a facultative mutualism, where the species benefit from the relationship but can survive independently if necessary. Trophic mutualism and dispersive mutualism are not mutually exclusive with obligatory or facultative mutualism, as they refer to the type of benefit (e.g. food, seed dispersal) provided in the mutualistic relationship.

A Mutualism in Which Two Species Must Live Together and Cannot