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What Specialization Do Dolphins and Whales Show in Their Sleep?​

Question 93

Multiple Choice

What specialization do dolphins and whales show in their sleep?​


A) Their sleep is composed entirely of REM sleep.
B) ​They sleep twice as long in summer as they do in winter.
C) ​They can sleep in half of the brain and not the other.
D) ​They take 5- to 10-minute naps each hour, all day.

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