Zero population growth can be achieved in a population when ________
A) ecological footprints are larger than carrying capacity
B) carrying capacity is larger than ecological footprint
C) birth rates equal death rates
D) total fertility rate exceeds the average replacement rate
E) the approach is having as many children in the first five years of marriage
Answer: C
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Which of the following statements about nitric oxide, NO, is false?
A) NO contains an unpaired electron. B) NO decreases the ability of the blood to carry oxygen. C) NO is an important signaling molecule in the cardiovascular system. D) None, all of the above are true.
Smog is responsible for which of the following?
a) An estimated 50,000–180,000 premature deaths in the U.S. annually. b) A global reduction in agricultural productivity. c) Extensive damage to forests. d) All of the above.
Which of the following is a pull factor for urban growth?
A. High unemployment in cities B. Better access to education at big universities C. Unemployment in farming communities D. Jobs in rural manufacturing E. None of these is a pull factor for urban growth
The Acid Rain Program established under the Clean Air Act of 1990 has been successful in reducing emissions of sulfur dioxide and ________
A) nitrogen oxides B) CFCs C) carbon monoxide D) carbon dioxide E) lead