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Question 2 of 5

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SAT Subject Test

It is thought that the Galapagos Islands were originally colonized by one species of finch. Today these islands contain many species of finches that occupy diverse niches. This most likely resulted from which of the following?

I. Biological Magnification
II. Convergent Evolution
III. Adaptive Radiation

Select an Answer

I. only

Correct Answer: 
No

II. only

Correct Answer: 
No

III. only

Correct Answer: 
Yes

II.and III. only

Correct Answer: 
No

I., II., and III.

Correct Answer: 
No

This is another question that requires you to assess I., II., and III. and decide which most likely resulted in the pattern of finch populations seen in the Galapagos. The correct answer is adaptive radiation only, (C). Biological magnification, I., refers to the bioaccumulation of materials, particularly problematic at higher trophic levels, and is not part of the correct answer, which rules out choices (A) and (E). Convergent evolution, II., refers to the independent development of similar characteristics in unrelated organisms as a result of adaptation to similar environments, and is not part of the correct answer, which rules out choices (B) and (D).

Question Difficulty: 
medium