Part 2 on explanations for the correct answers:
1. Which of the following interactions can be correctly be labeled as coevolution?
A. a genetic change in a virus taht allows it to exploit a new host, which responds to virus-imposed selection by changing its genetically controlled habitat preferences
2. Consider a field plot containing 200 kg of plant material. Approximately how many kg of carnivore production can be supported?
A. 2
3. Following clear-cutting of a broadleaf forest several hundred years ago, the land was colonized by herbaceous species that were replaced largely over time by shrubs, then by forest trees. Assuming the growth of the shrubs and trees was enhanced by the soil-holding properties of the herbaceous plants, which of the following processes best describe the progression from herbaceous plants to forest trees?
A. secondary succession; facilitation
4. There are more species in tropical areas than in places farther from the equator. This is probably a result of:
A. A longer growing season, and fewer major disturbances
5. What is the fundamental difference between matter and energy?
A. Matter is cycled through ecosystems; energy is not
6. How does phosphorus normally enter the atmosphere?
A. It does not enter the atmosphere in biologically significant amounts.
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