During infancy, __________. These sex differences will __________ during adolescence
A) boys are slightly shorter and lighter than girls; disappear
B) girls are slightly taller and heavier than boys; reverse
C) girls are slightly shorter and lighter than boys; be greatly magnified
D) boys are slightly shorter and lighter than girls; be greatly magnified
Answer: C
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The first year of life is considered to be
A. an egocentric or asocial period B. a period of extensive social interaction C. a period in which increased social sophistication decreases motor activity D. a period in which family relationships have little effect on motor development
Researchers who have looked at changes with age in total amounts of daily REM sleep and NREM sleep have found that
a. the amount of REM sleep increases considerably over the years. b. NREM diminishes more sharply than REM sleep over the years. c. the amount of REM sleep decreases considerably over the years. d. REM sleep remains fairly constant over the years, but NREM increases slightly.