Which of the following was a main objection to Alfred Wegener's continental drift hypothesis?
A) His glacial evidence wasn't accurate.
B) He didn't identify enough fossil remains to prove plates moved.
C) It lacked compelling evidence that the continents had been connected in the past.
D) He couldn't provide a credible mechanism.
Answer: D
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What is the biggest concern about CO2 in our atmosphere with regard to human actions?
A. The rapid rise in CO2 emissions over the past 50 years. B. CO2 was not an important greenhouse gas until 200 years ago. C. We have increased the amount of CO2 from <1% to over 10%. D. We could easily remove all CO2 from the atmosphere if we wanted.
Motor vehicle emissions are not a major source of air pollution.
Answer the following statement true (T) or false (F)
The result of China's policy of moving industry inland between 1949 and 1976 was
A) exports increased enormously. B) exports plummeted. C) the capital was moved inland. D) inland areas became rich, while the coast stagnated.
Which type of biologically important molecules includes many cyclic hemiacetals?
A) carbohydrates B) lipids C) proteins D) none of these