A knowledge of current world population density is of relatively little value in itself, primarily because the world population
a. is uniformly distributed.
b. is unevenly distributed.
c. changes its density each day.
d. is declining in density.
e. is predictable to very precise standards.
B
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Large areas of farmlands, woodlands, and green spaces in the United States have been protected by private, nonprofit groups called
A. urban green space. B. ecologists for conservation. C. debt-for-nature. D. land trusts. E. biosphere conservation.
An object is pulled by three forces: 200 N to the right, 400 N to the right, and the third at 300 N to the left. The net force is
A. 300 N to the left. B. 600 N to the left. C. 600 N to the right. D. none of the above
Which of the following statements about a scientific theory is not true?
a. It is an explanation for some natural phenomena. b. It has a large body of supporting knowledge. c. It is testable. d. It is conjecture or guess. e. none of the above
In the collision-coalescence process, the entire cloud is:
A) raining. B) snowing. C) below freezing. D) above freezing.