SAT Subject Biology Practice Question 343: Answer and Explanation

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Question: 343


A population of birds (Population A) on a remote, isolated island is studied to determine beak length. The resulting data are plotted in Figure 1.

Figure 1

Suppose that 200 years later, the beaks of the birds on the island were again measured (Population B). The data, when plotted, yielded a graph as in Figure 2.

Figure 2

How would beak length in the bird population change after another 200-year time span?

A. The average beak length would return to 30 mm.
B. The average beak length would shift to 40 mm.
C. The average beak length would shift to 20 mm.
D. The differences in beak length would be more pronounced.
E. It is not possible to determine how beak length might change.

Correct Answer: E


E Just because we have some information about how the population changed in the last 200 years, it doesn't tell us how it may change in the next 200 years. It would depend on how the environment changed during that time period.

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