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