Across
- 3. rain, snow, sleet or fog with a Ph level of below 7
- 4. variety of life in an area
- 5. Natural stripes of land that allow dee of immigration of organisms from one wilderness to another
- 7. Programs that release organisms into an area where there species once lived in hopes of reestablishing
- 10. Field of biology that studies method and implements plans to protect biodiversity
- 11. damage to a habitat by air land and air pollution
- 12. When Members of a species are held by people in zoos or other conservation facillities
- 15. philosophy that promotes letting people use resources in wilderness areas in ways that will not damage the ecosystem
Down
- 1. whhen the last members of a species die
- 2. seperation of wilderness areas from eachother
- 6. non native species in an area
- 8. a species in which the number of individual falls so low that extinction is possible
- 9. species that have rapidly decreasing numbers of individuals
- 13. layers of the atmosphere that helps protect living organisms on earth surface from the imaging doses of ultraviolent radiation from the sun
- 14. different environmental conditions that accur along the boundaries of an ecosystem