Answer:
b) marine scientists often face challenges when trying to capture sea life for research
Step-by-step explanation:
The first excerpt, about testing the water samples, says that the scientists are performing this experiment at midnight, which is very late. it also says that the net must be lowered to a specific depth. The second excerpt describes people trying to sort krill and other organisms, but it is very difficult for them to do so, as the floor and the water in the plate keep moving.