The number of persons aged 65 or older, divided by the number of persons age 20–64, times 100 is known as the _____
a. young adulthood as compared to aging adults ratio (YACA)
b. old-age comparison to youthfulness ratio (OACY)
c. age of retirement compared to the age of productivity ratio (ARCAP)
d. old-age dependency ratio (OADR)
Answer: D
Psychology
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Researchers studying chronic fatigue syndrome continue to focus on _____ as a potential cause.
Fill in the blank(s) with the appropriate word(s).
Psychology
In the male embryo, the primitive testes produce and secrete __________
a) dopamine. b) endorphins. c) androgens. d) estrogen.
Psychology