Maintaining healthy savannahs is largely dependent upon
A. thinning of dense stands of oak trees.
B. frequency of fires.
C. tornadoes.
D. frequency of hurricanes.
Answer: B
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Species that live a long life and have only a few offspring, such as humans, can be characterized as
A) K-selected. B) r-selected. C) autotrophs. D) omnivores.
According to many experts, which of these options would be most successful at slowing population growth in less-developed countries?
A. Empowering women with education and opportunity to start businesses B. Appointing younger men as tribal leaders C. Allowing foreign agencies to provide child care D. Allowing girls to skip school so they can contribute more to their families
Volcanic eruptions can produce huge floods by
A) melting ice sheets.
B) erupting huge quantities of water vapor.
C) displacing water in lakes.
Robert Constanza and his colleagues have shown that ________
A) the value of ecosystem services is more than $48 trillion in 2013 dollars B) ecosystems services cannot be assigned monetary values because they are external C) ecosystem services are valued at less than 0.5% of the U.S. GDP D) nutrient cycling is the least valuable of ecosystem services E) NAFTA has had environmental benefits worth $2.7 billion in 2011