Question

1. what groups of organisms are most in danger of extinction? 2 points a. those with small populations b. those that migrate or need special habitats c. those with large populations that breed quickly d. both (a) and (b) 12. what human activities have influenced recent extinction events? 2 points a. habitat destruction b. poaching c. introducing exotic species d. all of the above 13. reasons for preserving biodiversity include all of the following except 2 points a. isolating unique genetic material so it can be incorporated into existing crops. b. increasing the chances of discovering organisms with medicinal value c. preventing natural evolution. d. finding new plants that can supplement the worlds food supply. 14. how many species are estimated to be living on earth? 2 points

Explanation:

• Question 11: Organisms with small populations are more vulnerable as they have less genetic diversity and are more affected by random events. Those that migrate or need special habitats are also at risk because changes in their migratory routes or loss of their specific habitats (which are often limited in extent) can lead to extinction. Organisms with large populations that breed quickly have more resilience.
• Question 12: Habitat destruction removes the living space for species. Poaching directly reduces the number of individuals of a species. Introducing exotic species can out - compete native species for resources (e.g., food, space), prey on them, or introduce diseases. So all these human activities contribute to extinction.
• Question 13: Isolating unique genetic material for crop improvement (a), discovering medicinal organisms (b), and finding new food - supplying plants (d) are valid reasons for biodiversity preservation. Biodiversity preservation is not about preventing natural evolution. Natural evolution is a natural process, and biodiversity allows for evolution to occur in a healthy way.

Answer:

• 11. d. both (a) and (b)
• 12. d. all of the above
• 13. c. preventing natural evolution.