Across
- 3. is one which has been categorized by the International Union for Conservation of Nature as likely to become extinct.
- 4. species that have rapidly decreasing numbers of individuals.
- 5. field of biology that studies methods and implements plans to protect biodiversity.
- 6. the changes in population or community structures that occur at the boundary of two habitats.
- 7. is an umbrella term describing the complete process by which habitat loss results in the division of large, continuous habitats into a greater number of smaller patches of lower total area, isolated from each other by a matrix of dissimilar habitats, and is not just the pattern of spatial.
- 11. a rain or any other form of precipitation that is unusually acidic, meaning that it possesses elevated levels of hydrogen ions.
- 14. when members of a species are held by people in zoos or other conservation facilities.
Down
- 1. a layer in the earth's stratosphere at an altitude of about 6.2 miles (10 km) containing a high concentration of ozone, which absorbs most of the ultraviolet radiation reaching the earth from the sun.
- 2. programs that release organisms into an area where their species once lived in hopes of reestablishing naturally reproducing populations.
- 7. damage to a habitat by air, water, and land pollution.
- 8. is the degree of variation of life. It is a measure of the variety of organisms present in different ecosystems.
- 9. natural strips of land that allow the migration of organisms from one wilderness area to another.
- 10. plant or animal species introduced into an area where they do not occur naturally, non-native species.
- 12. when the last members of a species die.
- 13. philosophy that promotes letting people use resources in wilderness areas in ways that will not damage the ecosystem.