Across
- 5. philosophy that lets people use resources that dont harm the environment
- 6. nonnative species in an area
- 7. variety of life in an area
- 9. programs that release species into an area that the once lived
- 11. damage to a habitat by air
- 12. natural strips of land that let species migrate from one area to another
- 13. species that are close to becoming endangered
- 15. members of species held by people
Down
- 1. field of biology that studies methods and implements plans to protect biodiversity
- 2. different environmental conditions that occur along boundaries of an ecosystem
- 3. layer of the atmosphere that helps protect living organisms on Earths surface from damage from ultraviolet radiation from the sun
- 4. rain,snow,sleet, or fog with a pH below 7
- 8. separation of wilderness areas from each other
- 10. species that are very close to becoming extinicted
- 14. when the last member of a species dies