When one species depends on another for survival, it is called a(n) __________.
A)facultative mutualist
B)mutualist
C)competitor
D)obligate mutualist

Question

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When one species depends on another species for survival, it is called an obligate mutualist. Obligate mutualism refers to a mutualistic relationship that has evolved to be so specific that neither species can survive without the other. The term "obligate" is used because the relationship is obligatory or necessary for the survival of both species. Choice A (facultative mutualist) refers to a mutualistic relationship in which the species involved can survive without each other, but the relationship benefits both. Choice B (mutualist) is a broader term that refers to any type of mutualistic relationship between two or more species. Choice C (competitor) refers to a relationship between two species that are competing for the same resources, not mutually benefitting from each other.

When One Species Depends on Another for Survival, It Is