Pre History Puzzle

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Across
  1. 1. A member of a people who travel from one to another places to find food.
  2. 3. Ways to find the food by hunting
  3. 4. A period of time before human read or write a language
  4. 6. The main materials of paleolithic people to make their tools
  5. 7. A group of houses
  6. 11. Looking for foods
  7. 13. The activity of Paleolithic people
  8. 14. People who study about human's societies
  9. 15. The main shelter of paleolithic Era People
  10. 16. Moving from one to another places
  11. 17. A system of communication using by community
  12. 19. Period of time at pre history which human looking for food by hunter and gather
  13. 20. Object made by human
Down
  1. 2. The studies of human's societies
  2. 5. About farming
  3. 6. The left bones that can found underground
  4. 8. Period of time at pre history which human start living in permanent village
  5. 9. The main materials of Neolithic people to make their tools
  6. 10. Living the life of a nomad
  7. 12. The useful tools
  8. 18. Relation to DNA