Which statement about family size is true?
a. Wealthier people have more children
b. Couples with access to contraception have more children.
c. City dwellers have more children than those in rural areas.
d. Poorer people have fewer children.
e. Better-educated people have fewer children.
e
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There is an urgent need to improve the recycling strategy for e-wastes because
A) there is no profit to be made from the materials. B) they contain toxic but valuable materials, and U.S. recyclers tend to outsource to China. C) it has been easier and safer to dispose of e-wastes in landfills. D) e-wastes contain large amounts of radioactive materials.
Climate change is expected to increase maximum summer temperatures over the global mean in what part of the U.S.?
A) northwest B) northeast C) southwest D) southeast E) arctic
Diversity refers to
A. the number of individuals in a given area. B. the number of populations. C. the spatial distribution of organisms. D. the amount of genetic diversity.
Planetary scientists have successfully explored Mars using
A. landed rovers. B. orbiting spacecraft. C. sophisticated cameras. D. All of these choices are correct.