The spread of infectious diseases over space and time follows the rules of:
A. hierarchical diffusion.
B. spatial diffusion.
C. expansion diffusion.
D. contagious diffusion.
Answer: B
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The time equivalence of strata is determined by:
a. correlation of unusual lithologies. b. correlation of key beds. c. correlation of fossils. d. lateral tracing. e. superposition
Which of the following is the most abundant mineral group on the surface of the earth?
A. halides B. sulfides C. carbonates D. silicates
Under the 2009 Tobacco Control Act, the FDA
A) cannot regulate tobacco. B) can regulate cigarettes as a drug. C) can regulate only the way that cigarettes are packaged. D) can investigate the health effects of cigarettes but not regulate how they are manufactured and sold.