Earthamazing Crossworld Puzzle!

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Across
  1. 4. a type of species that pertinent or common to the whole world
  2. 7. Is any species intentionally or accidentally transported and released by man into an environment outside its present range
  3. 9. Formation of new species through evolution
  4. 11. Basic unit of soceity
  5. 12. Basic unit of life
  6. 13. a species confined to just one area
  7. 14. The variety of life forms on earth and the essential interdependence of all living things.
  8. 15. Coldest biome
Down
  1. 1. The process plants absorb sunlight and turn that energy into food
  2. 2. Richness The number of species that live in a certain location
  3. 3. The ability to do work
  4. 5. The different regions of our planet that have different climates, plants and animals.
  5. 6. Is the migration seen as an exit of individuals from one region
  6. 8. Is an earth ecosystem
  7. 10. Smallest part of matter