Premarital sex during adolescence is the most common in which of the following countries?
a. western European countries
b. African countries
c. South American countries
d. northern European countries
Answer: D
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When two ova are fertilized, they develop into
a. dizygotic twins. c. identical twins. b. monozygotic twins. d. zygotic twins.
Normal erectile functioning involves neurological, endocrine, vascular, and muscular factors
Indicate whether the statement is true or false
The difference between insomnia and sleep apnea is that _____
A) sleep apnea affects primarily the elderly, whereas insomnia is characteristic of children B) insomnia is treatable but sleep apnea is not C) sleep apnea is a precursor to narcolepsy, whereas insomnia is not D) insomnia is often characterized by sleeplessness, whereas sleep apnea is characterized by breathing difficulties
Injections of leptin in ob mice cause all of the following EXCEPT
a. increased metabolism. b. diabetes. c. increased body temperature. d. greater activity. e. less food consumption.