Ch. 9 Crossword Puzzle

2. A species with so few individual survivors that it could soon become extinct
5. "Love of life"
6. Habitat destruction, Invasive species, Population and resource use growth, Pollution, Climate change, Overexploitation
7. A designated place containing living plants collected for display and protection
8. A species that is still abundant in its natural range but is likely to become endangered in the future
9. The extinction rate before humans came on the scene
13. When substantial preliminary evidence indicates that an activity can harm human health or the environment, we should take precautionary measures to prevent or reduce harm
15. Occurs when a species is no longer found in one area but can be found elsewhere
17. The value of a species based on its beauty
19. A species' usefulness to humans in terms of ecological and economic services
20. A process involving collection of wild eggs laid by critically endangered birds then hatching them in zoos or research centers

1. The extinction of many species in a relatively short period of time
2. Species that respond quickly to environmental changes
3. A process involving the capture of wild individuals of a critically endangered species for breeding in captivity
4. Occurs when so few members of a species are left that it can no longer perform its biological role
10. The value of a species based on its inherent right to exist, regardless of its usefulness to humans
11. The value of a species based on the satisfaction humans derive from its existence
12. The extinction of many species in a relatively short period of time
14. Expressed as a percentage or number; the amount of species that go extinct within a certain time period
16. An invasive plant species imported from Japan and planted in the Southeastern U.S, in the 1930s
18. Any habitat surrounded by a different one