Across
- 1. field of biology that studies methods and implements plans to protect biodiversity.
- 3. different environmental conditions that occur along the boundaries of an ecosystem.
- 5. species that have rapidly decreasing numbers of individuals.
- 6. layer of the atmosphere that helps to protect living organisms on Earth's surface from damaging doses of ultraviolet radiation from the sun.
- 7. separation of wilderness areas from each other; may cause problems for organisms that need large areas for organisms that need large areas for food or mating.
- 10. rain,snow,sleet, or fog with a pH below 7; causes deterioration of forests, lakes, statues and buildings.
- 11. damage to a habitat by air, water and land pollution.
- 12. when members of a species are held by people in zoos or other conservation facilities
- 13. philosophy that promotes letting people use resources in wilderness areas in ways that will not damage the ecosystem.
- 14. variety of life in an area; usually measured as the number of species that live in an area.
Down
- 2. programs that release organisms into an area where their species once lived in hopes of reestablishing naturally reproducing populations.
- 4. when the last members of a species die.
- 8. a species in which the number of individuals fall so low that extinction is possible.
- 9. nonnative species in an area; may take over niches of native species in an area and eventually replace them.
- 11. natural strips of land that that allow the migration of organisms from one wilderness area to another.