TOEFL Listening: ETS-TOEFL听力机经 - 72V1X1G0RSF5LV6MP$

What point does the professor make about certain species of foraging ants? A. They often build their colonies underneath violet plants. B. They are the only nonflying insects that pollinate violets. C. They produce oil from a gland in their jaws that helps violet seeds germinate. D. They play an important role in the wide dispersal of violet seeds.