Ecology Study Guide Answers

1. Benefit
2. Benefit, Not harmed, does not benefit
3. benefits, harmed
4. ex. 1 - eyelash mites and humans, ex.2 - whale and barnacles, ex 3 - sea cucumber and pearlfish
5. a. Birth b. Death c. Emigration d. Immigration
6. emigrated, immigrated
7. Other squirrels in the community would have more competition for food; Animals that prey on squirrels will grow in population because they have more food; Producers that are eaten by squirrels will decrease in number
8. Phosphorous, Carbon, Water, Nitrogen
9. Bacteria
10. When organisms die and decompose; Urine
11. Organisms that have died many years ago.
12. Sun, Wind, Food, Water
13. Coal, Oil, Natural Gas
14. We started using coal and oil to produce more energy. More energy --> more food --> Increase in population
15. Agriculture, Urban Development, Hunting and Gathering
16. Rarely does being "green" pay off. Often times it comes at a personal cost. Human nature tends to only care about their own well being.
17. Global warming occurs when the atmosphere is thickened by the carbon emissions released by human activity. The thickening of the atmosphere causes more of the sun's heat to be trapped which leads to increased global temperature.
18. Primary succession - predictable changes in an ecosystem that starts from bare rock. Secondary succesion - predictable changes in an ecosystem that begins after the original community has been cleared. Starts with soil.