Why are sex ratios usually below 100?
a. Because many societies abort male fetuses.
b. Because more women than men are born.
c. Because women typically outlive men.
d. All of these responses are correct.
Question 2
The United States is a high-income country; therefore, we would expect population increase to result from which of the following?
a. Both immigration and natural increase
b. Natural increase only
c. Immigration only
d. Emigration only
