Urban planners suggest that it takes a population of about ________ to obtain the advantages of a city but still retain the sense of community.
A. 30,000 to 50,000
B. 90,000 to 100,000
C. 2500 to 5000
D. 500 to 1000
Answer: A
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The most important threat to survival of polar bears at this time is
a. ocean currents delivering pollutants to the Arctic Ocean from oceans in more temperate climate zones b. hunting by native populations c. tourism disruptions d. warming of the frozen Arctic, which has has caused the winter ice pack to shrink and break up earlier, thus limiting hunting opportunities for the bears e. a normal population cycle that will result in their slow extinction
Which organisms convert nitrogen gas to ammonium and nitrates?
A. plants B. animals C. bacteria D. fungi
Water use for irrigation in the region of the Aral Sea has resulted in
A. health problems from blowing toxic dust. B. decreased water salinity. C. increased crop yields because of nutrient salts deposited on fields. D. All of the choices are correct.
Air pollution generated in China affects air quality in WESTERN coastal states in the United States and in British Columbia, Canada.
Answer the following statement true (T) or false (F)