The Centers for Disease Control and Prevention employs many people who study epidemiology. Which of the following best describes the roles of people at the CDC?
A) identifying new types of infectious disease.
B) the prevention of infectious disease.
C) the worldwide distribution of infectious disease.
D) identifying, tracking the spread of, and preventing infectious disease.
D
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The return of the Magellan expedition to Spain in 1522 marked the end of the European Age of Discovery
a. True b. False
Which of these is most important for splitting the Sun's light into its separate colors?
A) diffraction B) interference C) internal reflection D) reflection E) refraction
What do climate models predict will happen to average temperatures in the northern hemisphere over the next 100 years?
A. Temperatures will stay about the same B. Temperatures will increase C. Temperatures will decrease
Of the following, the best example of a functional region is
A) the Corn Belt. B) the West Coast. C) Cajun Country. D) Chicago. E) North America.