Recent studies indicate that 1 in __________ Americans will contract at least one STI in their lifetime

Eight-month-old Darius will probably smile and laugh more

A) when interacting with familiar people. B) when surprised. C) at a friendly stranger with a novel face. D) at a stimulating toy.

The symptoms of REM sleep behavior disorder are opposite to those noted in

a. cataplexy. b. situational insomnia. c. somnambulism. d. nocturnal enuresis. e. manic-depression.