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Question
Tobacco and asbestos industries for decades denied that their products may cause cancers. One of the reasons why it was difficult to prove the carcinogenic nature of these products was the fact that carcinogens ________.A) are the least common toxicants
B) have a long lag time between exposure and disease
C) are rare in nature
D) are difficult to measure
E) are usually invisible
Answer
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Related questions
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Urbanization drives TFR down.
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Malthus was responsible for ________.
A) the book The Population Bomb, which described the disastrous effects of human population growth
B) the idea that, without social strictures, the increase in the human population would lead to famine and war
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The most accurate terms describing the trend over the past 50 years in resource use for human energy and agricultural systems are ________.
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B) decreasing and sustainable
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According to the IPAT model, the introduction of industrialized fisheries that use big trawlers, satellite navigation, and sonars to locate the fish ________.
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If global fertility rates remain at 2010 levels, the United Nations predicts that the world population will be approximately ________ billion in 2050.
A) 11
B) 9
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The transitional stage in Frank Notestein's demographic model is initiated by ________.
A) government intervention
B) the increased use of contraceptives
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Q:
Currently, the highest TFRs are in ________.
A) Africa
B) Asia
C) Latin America
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E) Europe (including Russia)
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Briefly explain the advantages and disadvantages to China's policy on population control.
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Briefly explain how the status of women affects population growth.
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A) facilitation
B) succession
C) coevolution
D) climax
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A) primary succession
B) secondary succession
C) coevolution
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Briefly explain deep ecology.
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Toronto's greenbelt, created by the government of Ontario, is a means of ________.
A) developing more golf courses in the region
B) containing urban development while protecting natural or agricultural lands in the area
C) ensuring greenery within and around the City of Toronto
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B) a walkable city centre and an expanded bus system can solve a large city's traffic congestion
C) once roads are widened, traffic congestion decreases
D) prohibition of motorized vehicles in urban areas reduces pollution and saves energy
E) traffic flows smoothly once pedestrians and bicycles are eliminated
Q:
What is a downside of establishing urban growth boundaries (UGB)?