Of the following measurements, which is the longest?
A. 3000 micrometres
B. 25 mm
C. 2 cm
D. 10-3 m
Answer: A
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In the case of sanitary landfills, the cost of disposing of wastes is ________ as technology provides safer alternatives.
A. Slowly increasing B. Staying relatively stable C. Sharply decreasing D. Sharply increasing E. Slowly decreasing
What is the main determinant for air’s water vapor capacity?
A. volume of air mass B. atmospheric composition C. air pressure D. temperature E. air density
Tropical rain forests cover about ____ of the earth's surface, but contain at least ____ of the known terrestrial plant and animal species.
A. 2%; 50% B. 10%; 50% C. 2%; 20% D. 30%; 30% E. 50%; 50%
The number of people who are too young or too old to work compared to the number of people in their productive years is called the
A) social dependence rate. B) productive capacity ratio. C) elderly support ratio. D) infant mortality rate. E) dependency ratio.