A "closed community" has a
A. Very small area
B. Gradual transition zone
C. Wide ecotone
D. Narrow ecotone
E. Large core area
Answer: D
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Which of the following about improvements in air quality is correct?
A. Ozone levels have decreased greatly because there is less nitrogen gas in the atmosphere. B. Lead emissions have decreased greatly because of the use of catalytic converters which remove lead from vehicle exhaust. C. Carbon monoxide emissions have decreased greatly because carbon monoxide is destroyed by oxygen in the atmosphere. D. Sulfur dioxide emissions have decreased greatly because power plants were required to reduce their emissions which caused acid deposition.
Predict which Central Asian state will likely progress at the fastest rate toward democracy
What will be an ideal response?
Mount St. Helens
A. had a revival of dome growth in 2004 B. is part of the Cascade Range C. last erupted violently in 1980 D. all of the preceding
How many DNA base pairs are wound around the histone core of a nucleosome?
A) 47 B) 97 C) 147 D) 197