TOEFL Listening: ETS-TOEFL听力机经 - J59JLCU6Z99H9RU6P$

What point does the professor make when she mentions the noise that squirrels make? A. Noise is not an effective deterrent against snakes. B. Communication between members of a species is as important as predator-prey communication. C. Most animals use such noises to discourage predators. D. Most predator-prey communication is well understood.