AP Biologyeasymcq1 pt
Commensalism is an interaction where
A.one species benefits and the other is unaffected
B.both species benefit
C.one benefits at the other's expense
D.both species are harmed
Explanation
Core Concept
Commensalism describes an interaction in which one species benefits while the other is not measurably helped or harmed. Examples are context-dependent because small effects on the second species can be difficult to detect. There is no sound basis for teaching commensalism as universally the 'rarest' interaction type.
Correct Answer
Aone species benefits and the other is unaffected
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