Darwins word puzzle

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Across
  1. 3. a member of a people who have no fixed residence
  2. 5. a major political unit having a territory of great extent
  3. 7. the beliefs, customs, arts, etc. of a particular social group
  4. 8. an ancient region in W Asia between the Tigris and Euphrates rivers
  5. 10. the belief in only one deity, or God.
  6. 11. to reduce to a code
  7. 12. a pictorial character used in a system of writing.
  8. 14. is characterized by the beginning of a settled human lifestyle
  9. 15. an independent city that encompasses the totality of its sovereign territory
Down
  1. 1. a relatively high level of cultural and technological development
  2. 2. an ancient cultural stage of human development
  3. 4. Hammurabi is my god
  4. 6. believing in or worshiping multiple gods.
  5. 9. a ruler of ancient Egypt
  6. 12. a body of persons in authority
  7. 13. a succession of rulers of the same line of descent