SAT Subject Biology Practice Question 340: Answer and Explanation

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Question: 340


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

What is the average beak length (in cm) of the birds in Figure 1 ?

A. 30 cm
B. 15 cm
C. 5 cm
D. 3 cm
E. 1 cm

Correct Answer: D


D The question asks for the average beak length in cm, but the graph gives it in mm. Average beak length is 30 mm. 10 mm = 1 cm; therefore, 30 mm = 3 cm. Read the questions carefully!

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