Nabriel Ortiz and Jessi McIntosh period 2

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Across
  1. 2. Nonnative species in an area; may take over niches of native species in an area and eventually replace them
  2. 3. Seperation of wilderness areas from each other; may cause problems for organisms that need large areas for food or mating
  3. 4. Layer of the atmosphere that helps to protect living organisms on Earth's surface from damaging doses of ultraviolet radiation from the sun
  4. 6. Variety of life in an area; usually measured as the number of species that live in an area
  5. 7. Field of biology that studies methods and implements plans to protect biodiversity
  6. 9. Rain snow,sleet, or fog with a pH below 7; causes the deterioration of forests,lakes,statues,and buildings
  7. 10. Natural strips of land that allow the migration of organisms from one wildness area to another
  8. 11. When the last members of a species die
  9. 12. A species in which the number of individuals falls so low that extinction is possible
  10. 13. When members of a species are held by people in zoos or other conservation facilities
  11. 14. Philosophy that promotes letting people use resources in wildness areas in ways that will not damage the ecosystem
Down
  1. 1. Programs that release organisms into an area where their species once lived in hopes of reestablishing naturally reproducing populations
  2. 3. Damage to a habitat by air, water, and land pollution
  3. 5. Different environmental conditions that occur along the boundaries of an ecosystem
  4. 8. Species that have rapidly decreasing numbers of individuals