Across
- 2. When the last members of a species die
- 4. Damage to a habitat by air,water,and land pollution
- 8. Different environmental conditions that occur along the boundaries of an ecosystem
- 9. Variety of life in an area
- 10. Programs that release organisms into an area where their species once lived in hopes of reestablishing naturally reproducing populations
- 13. Nonnative species in an area
- 14. Philosophy that promotes letting people use resources in wilderness areas in ways that will not damage the ecosystem
Down
- 1. Rain,Sleet,Snow,or Fog with pH below 7
- 3. Layer of the atmosphere that helps to protect living organism on earth's surface from damaging dosesof ultraviolet radiation from the sun
- 4. Separation of wilderness areas from each other
- 5. field of biology that studies methods and implements plans to protect biodiversity
- 6. Natural strips of land that allow the migration of organism from one wilderness area to another
- 7. When members of a species are held by people in zoos or other conservation facilities
- 11. A species in which the number of individulas falls so low that extinction is possible
- 12. species that have rapidly decreasing numbers of individuals