Question

sleep is a difficult problem for dolphins because dolphins _________. a. need more sleep than their predators b. must be awake and aware to breathe c. are unable to dream during sleep d. cannot swim while they are asleep please select the best answer from the choices provided

Explanation:

Dolphins are mammals and must consciously breathe. They need to be awake and aware to surface for air, making sleep a challenge.

Answer:

B. must be awake and aware to breathe