1 a-f. In each case, more than one answer is possible. Note too that in each case, the result will be a cascade of events.
2 a-d. Answers will vary.
3. Answers will vary.
4. Answers will vary.
5. Too much nutrient will cause a "bloom" or an overpopulation of one or more species. This will cause an imbalance in the system.
6. Answers will vary but most students will probably mention Chernobyl.
7 a. Primarily smokestacks releasing sulfur and nitrogen oxides.
b. Carbon dioxide.
c. Organic pollutants from detergents, halogens, hydrocarbons, humic acids. Inorganic pollutants from chloride, heavy metals, nitrogen, phosphorus.
8. This does not take into account interactions between species and between species and their environment.
TO THINK ABOUT
1. Answers will vary but should generally follow the first section of this chapter.
2. Answers will vary. Challenge your students. Remind them that over 99% of all species that have ever lived are now extinct.
3. Not everything is accounted for.
4. Answers will vary but should include the unexpected.
5 a. Chlorofluorocarbons
b. Carbon dioxide
c. Poor agricultural practices
d. Clearing the land
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