TOEFL Listening: ETS-TOEFL听力机经 - LV4H2OSI6F3XXJ13P$

Why does the professor mention organisms that thrive in the upper portions of the ocean? A. To contrast glacial meltwater with ocean water B. To discuss a limitation of a certain type of scientific device C. To indicate a new research area to which flotsam science can contribute D. To provide an example of how ocean currents affect water temperatures