SAT Subject Biology Practice Question 124: Answer and Explanation

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Question: 124

14. The graph depicts the population size of a species over time.

Which of the following could account for the differences in population size between time 2 and time 3?

A. Decline in populations of parasitic species
B. Decline in predator population size
C. Decline in interspecies competition
D. Decline in intraspecies competition
E. Decline in available food resources

Correct Answer: E


Because carrying capacities are shaped by so many ecological factors, a fluctuation of just one cannot exact such extreme change on them; only an extreme environmental change such as a natural disaster could drastically decrease a population's carrying capacity.

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