Chapter 1 1. A zoologist examines the DNA of the two populations described by the five scenarios in the previous question. The results of these studies would probably demonstrate that the DNA of the groups in scenario(s) ___ would be very similar. a. a and c. b. e only. c. b and c. d. b, d, and e. e. c and d. 2. a. b. c. d. e. All of the following may result from deforestation except one. Select the exception. Global warming is promoted. Extinction of many plant and animal species occurs. Regional water shortages occur. Long-term improvement in the standard of living in less developed countries occurs. Loss of important human resources like new drugs and food occurs. 3. In the next 40 years most human population growth will occur in _______ and result in a world population of about ____. a. less developed countries/6.6 billion b. less developed countries/9.3 billion c. less developed countries/20.5 billion d. developed countries/5.5 billion e. developed countries/10.2 billion 4. a. b. c. d. A species in imminent danger of extinction is a _______ species. threatened endangered rare jeopardized 5. Which of the following statements is true regarding species that are at risk of extinction? a. There are approximately 15,500 species listed by conservation groups as being at risk. The actual number is probably higher. b. There are approximately 5,000 species listed by conservation groups as being at risk. The actual number is probably lower. c. There are approximately 12,000 species listed by conservation groups as being at risk. This is probably a very accurate figure. d. There are approximately 2,000 species listed by conservation groups as being at risk. The actual number is probably lower. 6. Which of the following is the reason for the qualification in the answer to the previous question? a. Taxonomists are certain that there are far more species in threatened ecosystems than have been described. b. Taxonomists are confident that virtually all species have been described. c. Taxonomists have overestimated the number of threatened species in order to increase awareness of the problem of extinction.