In the context of physical and mental health, which of the following statements is true of the hormone melatonin?
A. Its secretion leads to the maturing of the sex organs.
B. The timing of its secretion is a gauge of when the brain is ready for sleep.
C. Its secretion leads to the development of body odor.
D. The quantity of its secretion determines the amount of body fat in adolescents.
Answer: B
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According to the concept of kin selection, you are more likely to behave altruistically
toward a. a brother over a sister. b. a cousin over a brother. c. any sibling over your parents. d. a sister over a cousin. e. an aunt or uncle over a sibling.
In the United States and most developed countries, infants
a. are carried in their parents' arms most of the time they are awake b. spend their days strapped onto their mother's back c. are moved about in containers with wheels, such as strollers d. receive less time to crawl and explore in a safe environment than infants in developing countries