Research on 16-year-old sexual abstainers, low risk-takers, and high risk-takers found that
A. abstaining was most common in teens with unwed mothers.
B. high-risk teens looked more mature at earlier ages than teens from the other groups.
C. low-risk teens were most likely to be involved in romantic relationships.
D. there was no relationship between behaviors exhibited between ages 9 and 12 and later sexual activity.
Answer: C
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In American couples, infertility occurs in approximately:
a. one in 6 or 7 couples. c. It depends upon ethnicity. b. one in 15 couples. d. It depends upon socioeconomic status.
How many pairs of chromosomes are normally in each cell of the human body?
a) 46 b) 23 c) 21 d) 22
Which of the following occurs when a human being experiences chronic stress?
A) The parasympathetic nervous system does more work than the sympathetic nervous system. B) Adrenaline and norepinephrine are constantly circulated in the body. C) Glial cells begin producing neurotransmitters to help out motor neurons. D) Afferent nerves start carrying information out of the brain and spinal corD.
Midlife adults ________________________
a. stay unemployed longer than young adults after experiencing a job loss b. tend to get a job of higher status and higher pay when they get a new job after being unemployed c. have higher absenteeism rates than young adults due to a weakened immune system with advancing age d. are less satisfied with their jobs than are younger adults