OSA and NSA

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Across
  1. 4. Main form of technology
  2. 6. Growing crops
  3. 7. paintings in caves
  4. 8. They gave something to another person and they got something in return
  5. 9. Group of 20-50 people
Down
  1. 1. Tame animals for human use
  2. 2. Killed animals for food
  3. 3. They started using this type of material for tools
  4. 4. Extra food
  5. 5. Something that keeps warm