Many countries have greatly reduced or eliminated landfills
A. because of environmental concerns.
B. and rely on recycling and incineration to dispose of municipal solid waste.
C. because they have little land available for landfills.
D. All of these statements are correct.
Answer: D
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Density-independent factors tend to be
A. more associated with abiotic factors. B. unable to lower reproductive gains in a population. C. more associated with intrinsic factors. D. more influential with natality rates than mortality rates.
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.
The first national park in the world was ________
A) Grand Canyon B) Yosemite C) Death Valley D) Yellowstone E) Glacier
Subsistence agriculture produces food for the people who raise it
Indicate whether the statement is true or false.