Multiple Choice
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.
Correct Answer:
Verified
Correct Answer:
Verified
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