TOEFL Listening: ETS-TOEFL听力机经 - 47QG33MV33NPO380P$

Why does the professor discuss fish coloration? A. To support the shelter-from-predators hypothesis B. To point out a difference between tuna and other fish species C. To emphasize the connection between a fish's diet and its coloration D. To explain why not all fish species aggregate under floating algae