The atmospheric content of ________ has been increasing for the last century
What will be an ideal response?
Answer: carbon dioxide
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From a biodiversity perspective, which is the greater concern with regard to siltation and reservoirs in the Colorado River Basin?
A. Downstream silt losses have impaired the coastal delta wetlands B. The lake might become too silted to produce electricity C. Lowered water capacity may impair agricultural production D. Lowered water capacity may result in people moving away
Which of the following best categorizes the most common form of interspecific species interactions?
a. Competition b. Mutualism c. Parasitism d. Commensalism e. Predation
Does a land breeze blow toward or away from the shore?
What will be an ideal response?
According to the U.S. Department of Energy, the U.S. could meet the carbon emission reduction targets in the Kyoto Protocol
A) at a cost of approximately $5 to $10 billion a year. B) at a savings of $7 to $37 billion a year. C) at a cost of approximately $10 to $15 billion a year and with a risk of higher unemployment. D) without any economic benefits or detriments.