SAT Subject Biology Practice Question 239: Answer and Explanation

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Question: 239

9. Which of the following is a biotic factor that limits the growth of a population in aquatic ecosystems?

A. Depth
B. Competition
C. Light penetration
D. Nutrient availability
E. Dissolved oxygen level

Correct Answer: B


Competition, which involves the use of resources by other species, is a biotic factor that limits population growth. The remaining answer choices are abiotic factors.

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