In the early 1900s when Greta's great-great-grandmother was born, ___ of America's population was over 65 years old. By 2007 when Greta was 10, her family celebrated her grandmother's 67th birthday, making her grandmother one of more than _______ as many Americans aged over 65 than there were in 1900.
A) 10; two times
B) 2; three times
C) 4; three times
D) 6; four times
Question 2
As our population ages, how does this affect work to meet the first Healthy People 2020 goal to increase health expectancy?
A) It will make little difference.
B) It will make this work easier.
C) It will make this work harder.
D) It will make it less important.
Ethnic Groups of Eastern North America, 1750
Fertility and Population Density, 1850
A recruiting poster for the “True Sons of Freedom” encouraged African Americans to enlist. In fact,
Sources of income for U.S. population aged 65 and over.
Another early evolutionary example of immunity When a red sponge and a blue sponge are blended ...
Human and great ape chromosome evolution