i have no clue

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Across
  1. 2. move from one area and settle in another
  2. 4. era- period of new stone age
  3. 5. a group of people who abide by the same principles
  4. 7. era- a prehistoric period of human history
  5. 8. the process of taming an animal
  6. 11. ages- a glacial episode of the past
  7. 13. a device or implant
  8. 14. from one who is descendant
  9. 15. gatherers- a person who hunts fishes and harvest wild food
Down
  1. 1. human fossil ancestors
  2. 3. era- middle stone age
  3. 6. the period of time before written records
  4. 9. a large stone that forms a prehistoric monument
  5. 10. the science of practice farming
  6. 12. bridge- a connection between two parts of land