#Question id: 9209
#Unit 9. Diversity of Life Forms
Introduced species can have deleterious effects on biological communities by ________.
#Question id: 9210
#Unit 9. Diversity of Life Forms
Overharvesting encourages extinction and is most likely to affect ________.
#Question id: 9211
#Unit 9. Diversity of Life Forms
Of the following ecosystem types, which have been impacted the most by humans?
#Question id: 9212
#Unit 9. Diversity of Life Forms
Burning fossil fuels releases oxides of sulfur and nitrogen. These air pollutants can be responsible for ________.
#Question id: 9213
#Unit 9. Diversity of Life Forms
Suppose you attend a town meeting at which some experts tell the audience that they have performed a cost-benefit analysis of a proposed transit system that would probably reduce overall air pollution and fossil fuel consumption. The analysis, however, reveals that ticket prices will not cover the cost of operating the system when fuel, wages, and equipment are taken into account. As a biologist, you know that if ecosystem services had been included in the analysis, the experts might have arrived at a different answer. Why are ecosystem services rarely included in economic analyses?
#Question id: 9214
#Unit 9. Diversity of Life Forms
Researchers have been studying a rare population of 87 voles in an isolated area. Ten voles from a larger population were added to this isolated population. Besides having ten additional animals, what benefits are there to importing individuals?