Ecology

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Across
  1. 2. of all
  2. 4. area
  3. 6. that have
  4. 8. life
  5. 10. the combined
  6. 12. life
  7. 15. of the planet in which all of
  8. 17. populations
  9. 18. and live in
  10. 20. ecosystem
Down
  1. 1. study of interactions
  2. 3. organisms
  3. 5. that influence
  4. 7. and the environment.
  5. 9. live together
  6. 11. that live in
  7. 12. organisms and between
  8. 13. exist, including land, water and
  9. 14. a group of
  10. 16. same climate
  11. 19. non-living