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