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It Appears That Birds Are Able to Spend the Migratory

Question 160

Multiple Choice

It appears that birds are able to spend the migratory season


A) without any sleep at all, even when kept from migrating.
B) in REM sleep even though it is flying through the air.
C) in a newly discovered stage 6 of sleep.
D) in stage 4 sleep without showing paradoxical sleep.

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