SAT Subject Biology Practice Question 200: Answer and Explanation

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Question: 200

10. Which of these are relationships in which one species benefits at the expense of another?

I. Commensalism

II. Competition

III. Parasitism

IV. Predation

A. III only
B. III and IV
C. I, II, and III
D. II, III, and IV
E. I, II, III, and IV

Correct Answer: D

Explanation:

In competition, parasitism, and predation, one species benefits at the expense of the other. Commensalism is an ecological relationship in which one species benefits while the other is neither helped nor harmed.

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