A one-way relationship where one species benefits at the expense of an

1.	A one-way relationship where one species benefits at the expense of another is called .................
A.	Commensalism
B.	Competative exclusion
C.	Parasitism
D.	An obligatory relationship
Answer» D. An obligatory relationship

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A one-way relationship where one species benefits at the expense of another is called .................

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