39. The passage most strongly emphasizes that the process of osmosis is necessary for the eels' transition from:
Your Answer is
Correct Answer is A
Explanation
According to the osmosis of the question stem, locate lines 61-66, "osmosis is to adapt to huge changes in water pressure and go to places with higher water pressure." It can be judged by common sense that the deeper the water, the higher the water pressure. So item A is correct.