TOEFL Listening: ETS-TOEFL听力机经 - 14C43WR469CA11Q9P$

What does the professor say about major environmental events on the Galápagos Islands? A. They account for the fact that finches are found on just a few of the islands. B. They might explain some of the differences among the finch species found there. C. They pose a threat to the size of the finch population there. D. They occur less frequently now than they did in the past.