Sounds above 20,000 Hz are called ________.

A. hypersonic
B. supersonic
C. subsonic
D. ultrasonic

Answer: D

Psychology

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According to your textbook, which of the following is among the four leading causes of serious illness and death and is worsened by the presence of psychological stress?

a. AIDS b. Chronic lung disease c. Diabetes d. Obesity

Psychology

REM sleep periods become ______ and dreams become ______ intense during the latter half

of sleep. a. shorter, less c. shorter, more b. longer, less d. longer, more

Psychology