Gains in life expectancy over the last 125 years are due primarily to
a. increased exercise and lower alcohol and nicotine consumption.
b. genetic engineering that has delayed the aging process.
c. reduced deaths of young children and mothers in childbirth.
d. lower ingestion of high-cholesterol foods.
Question 2
Due to aging of the baby boom generation and current trends in birth and death rates, the proportion of elderly in the
U.S. is projected to be by 2030.
a. 10 percent
b. 15 percent
c. 20 percent
d. 30 percent