Physical changes marking the onset of puberty are known as
A. primary sex characteristics.
B. secondary sex characteristics.
C. ovotesticular syndrome.
D. menopause.
Answer: B
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A family of chemicals produced in the body that resemble opiates are the
a) dopamines. b) acetylcholines. c) endorphins. d) biogenic amines.
The split litter technique can be used in animal learning research for which experimental design?
a. matched groups design b. between subjects design c. within subjects design d. random groups design
For Stumpf, the proper objects of study for psychology are:?
a. ?the elements of thought b. ?elemental feelings c. ?mental phenomena d. ?physiological mechanisms
By the end of his or her first year, the typical infant ____
a. weighs 20% less due to the loss of baby fat b. weighs the same as they did at 6 months of age c. doubles his or her body weight d. triples his or her body weight