Discussion
An interactive association between two populations in which one population benefits from the association, while the other is not affected, is
Answer: C
When one population benefits from an association and the other is not affected, the interaction is commensalism, written (+, 0). Mutualism benefits both populations (+, +), neutralism affects neither (0, 0), and symbiosis is the general term for a close living-together association, which can be mutualistic, commensal or parasitic, so it is not specific to the benefit-and-no-effect case described. Examples are a barnacle growing on a whale, which gains a place to live while the whale is unaffected, and an orchid growing on a tree.
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