Chapter 5 Bio Sam Worrall

2. when the last members of a species die
4. layer of atmosphere that helps to protect living organisms on Earth's surface from damaging doses of ultraviolet radiation from the sun.
6. different environmental conditions that occur along the boundaries of an ecosystem
7. field of biology that studies methods and implements plans to protect biodiversity.
10. natural strips of land that allow the migration of organisms from one wilderness area to another.
11. variety of life in an area
12. separation of wilderness areas from each other; may cause problems for organisms that need large areas for food or mating.
15. species in which the number of individuals falls so low that extinction is possible

1. programs that release organisms into an area where their species once lived in hopes of reestablishing naturally reproducing populations.
3. damage to a habitat by air, water, and land pollution
5. species that have rapidly decreasing number of organisms.
8. philosophy that promotes letting people use resources in wilderness areas in ways that will not damage the ecosystem.
9. when members of a species are held by people in zoos or other conversation facilities.
13. rain, sleet, or fog with a pH below 7; causes the deteriation of forests, lakes, statues, and buildings
14. species nonnative species in an area; may take over niches of native species in an area and eventually replace them