On average how many supertankers or containerships are reported missing each year without a trace?
A) 10
B) 100
C) 500
D) 1,000
E) 5,000
A
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People who propose that threatened plants should be protected because they may yield valuable medicines believe in the ____ value of species.
A. economic value. B. instrumental value. C. medical value. D. ecological value. E. biological value.
Everything else being equal, the more CO2 in the atmosphere, the ____
a. cooler the surface air b. warmer the surface air c. more cloud cover of Earth d. greater the amount of precipitation e. the more likely ice will form in polar regions
What caused the glacial ages?
A. changes in the atmosphere B. changes in circulation of sea water C. changes in the positions of the continents D. All of the above have contributed to the glacial ages. E. The cause is unknown at this time.
Total fertility rates (TFRs) have been increasing since the 1950s in less-developed countries and dropping in more-developed countries.
Answer the following statement true (T) or false (F)