What is the limiting factor that produces specialized adaptations in plants and animals of the desert?
A. light
B. moisture
C. temperature
D. reproductive success
E. migration
B
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All of the following are criteria used by the U.S. Department of Transportation to determine if it is a hazardous material EXCEPT
A. any poisonous or toxic materials. B. any explosive materials. C. any gases. D. any flammable materials. E. any liquid materials.
During the early communist period, state control of social development was ________ and political dissent was ________
A) pervasive; suppressed B) lax; encouraged C) encouraged; discouraged D) non-existent; frowned upon
In a chemical reaction, ________
A) new elements are formed B) new atoms are formed C) atoms are destroyed D) atoms are rearranged
What is the primary chemical responsible for the ozone hole?
A. carbon monoxide B. carbon dioxide C. methane D. smog E. CFCs