The extinction of dinosaurs was important to the evolution of mammals because
a. this opened many new habitats for mammals.
b. with less competition, mammals were able to diversify.
c. with new adaptive opportunities, mammals were greatly able to increase in
numbers.
d. A and B
e. all of the above
E
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The basic building block of all silicate minerals is the
A. silicate triangular structure. B. crystalline silicate sulfur. C. silicate tetrahedron. D. silicate cleavage direction.
Which of the following is the most true?
A. At this time, soil is eroding in the U.S. about 10 times faster than it is forming. B. The most important agent of soil erosion is winter frost heave. C. Very little farmland in the United States has experienced moderate to severe erosion lately. D. Soil erosion is always easily reversible, using conservation techniques.
The Human Development Index
A) measures the rate of population growth in every nation. B) is an EPA program that measures the effects of pollution on birth defects. C) is a UNDP program that tracks health, education, and living standards of all nations. D) has increased for all nations since 1970.
The number of naturally occurring chemical elements is approximately
A. 36. B. 90. C. 200. D. 106.