TOEFL Listening: ETS-TOEFL听力机经 - 5BIBI72FXA8C7465P$

What point does the professor make about sea butterflies that are captured by amphipod? A. They are often eaten by the amphipods. B. They are eventually released by the amphipods; C. They are used as a lure by the amphipods to attract prey. D. They benefit from their relationship with the amphipods.