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Among adult humans, those who sleep ____ or more hours per night have the highest percentage of REM ...

slickshot76

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Among adult humans, those who sleep ____ or more hours per night have the highest percentage of REM ...

Among adult humans, those who sleep ____ or more hours per night have the highest percentage of REM sleep.

a. 9
b. 5
c. 8
d. 10

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LittleMarc

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