When Sleep Researchers Have Studied Humans and Other Species, They

Multiple Choice

When sleep researchers have studied humans and other species, they found that:

A) only the higher mammals, such as humans, the great apes, and bottlenose dolphins, experience REM sleep.
B) moles, since they can hardly move their eyes at all, are unable to experience REM sleep.
C) humans begin to show evidence of REM sleep during the first two weeks after birth.
D) nearly all mammals, with the exception of spiny anteaters, bottlenose dolphins, and the porpoise, experience REM sleep.