Dolphins are able to sleep without drowning because they
A)have gills, like fish do.
B)have a special opening that allows air in but not water.
C)sleep on just one side of their brain at a time.
D)inflate their bodies before sleep, which maintains them floating upright so they can breathe without taking in any water.

Question

Quizplus · Accepted Answer

Dolphins sleep with one half of their brain at a time, allowing the other half to remain awake so they can come to the surface to breathe. This unique adaptation enables them to rest without the risk of drowning.

Dolphins Are Able to Sleep Without Drowning Because They