This is the second leading cause of death in the United States

Which condition has often been interpreted as an intrusion of REM sleep into wakefulness?

a. narcolepsy b. sleep apnea c. REM behavior disorder d. omnambulism

Your text describes the use of _______ to get a bull elephant to cooperate with having his toenails trimmed

a. physical restraint b. shaping c. chaining d. episodic training