SAT Subject Biology Practice Question 302: Answer and Explanation

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Question: 302

12. Two organisms live in close association with each other. One organism is helped by the association, whereas the other is neither helped nor harmed. Which of the following terms best describes this relationship?

A. Mutualism
B. Commensalism
C. Symbiosis
D. Parasitism
E. Predator-prey relationship

Correct Answer: B


B This symbiotic relationship describes commensalism. In mutualism both partners benefit, in parasitism and predator-prey relationships one partner benefits while the other is harmed, and symbiosis is just a general term used to describe close living arrangements.

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