How do scribes show that the ancient Mesopotamians were advanced?

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Across
  1. 3. term that describes the way of life for nomadic tribes (2 words)
  2. 7. a very long story or poem
  3. 9. belief in many gods
  4. 11. new stone age
  5. 13. king of Persia
  6. 15. to tame wild animals and plants
  7. 16. the people of Sumer
  8. 17. a type of irrigations system
  9. 18. a ruler who was interested in justice
  10. 19. an ancient person who did not have a permanent home
Down
  1. 1. an organized system of law
  2. 2. the land between two rivers (2 words)
  3. 4. builder of the hanging gardens and the Ishtar gate
  4. 5. a kingdom
  5. 6. a hero
  6. 8. The first official writing system
  7. 10. a group of people who live together and share a common culture
  8. 12. the land between two rivers
  9. 14. an ancient Mesopotamian temple