Guns, Germs, and Steel

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Across
  1. 2. original people of a land
  2. 4. land plowed or unseeded for a season
  3. 6. the state of being immune
  4. 12. an extensive plain, especially without trees
  5. 15. to establish a colony
  6. 17. means of supporting life
  7. 18. an entire scale or range
  8. 20. extremely prevalent or widespread disease
  9. 23. an organism that lives on or in another
  10. 24. not to be persuaded or moved
Down
  1. 1. to draft for military or naval service
  2. 3. an animal that eats meat
  3. 5. belief in equality of all people
  4. 7. to bring under complete control
  5. 8. leaving no doubt
  6. 9. any plant of the grass family yielding edible grains
  7. 10. to ask, demand, or claim something without proof
  8. 11. the body of a person or animal
  9. 13. not excessive in degree
  10. 14. an ultramicroscopic infectious agent
  11. 16. open to view or knowledge
  12. 19. classified according to various criteria into levels
  13. 20. natural to a specific people or place
  14. 21. distinct in some kind
  15. 22. any preparation used to confer immunity against a disease