In the late 1970s, the United States banned the non-essential use of chlorofluorocarbons (CFCs). Why?
A) CFCs are a primary component of photochemical smog.
B) CFCs are toxic gases.
C) CFCs reduce the ozone concentration in the stratosphere.
D) CFCs react with water vapor to form acid rain.
C
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Suggest an explanation for why aspirin has a sour taste.
A. It is the acidic nature of aspirin that gives rise to its sour taste. B. It is the basic nature of aspirin that gives rise to its sour taste. C. The sour flavor is added to help prevent overdosing. D. Aspirin is made sour as a mandated child safety feature.
Over the last four decades, global energy consumption has decreased
Indicate whether this statement is true or false.
Christopher Columbus believed during his lifetime that he had discovered the New World
a. True b. False
The ________ rate in more developed countries is higher on average than in less developed countries
A) birth B) natural increase C) infant mortality D) total fertility E) death