Stone Age Crossword Puzzle

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Across
  1. 5. extra food
  2. 7. people who make and enforce rules
  3. 8. farming
  4. 9. becoming an expert in something
Down
  1. 1. taming animals
  2. 2. a complex human society
  3. 3. natural item
  4. 4. man-made object
  5. 6. a ditch that moves water from a river