Over a period of 100 years, life expectancy in the United States change in which of the following ways?
a. It increased from 47 years to 77 years.
b. It remained stable at 65 years.
c. It increased from 50 years to 65 years.
d. It actually declined because of all the environmental problems on the planet in the year 2000.
e. There is no real accurate count of life expectancy in the United States
A
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Fill in the blank(s) with the appropriate word(s).
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