Biology

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Across
  1. 3. ancient tools
  2. 6. bipedal primates
  3. 8. rock moved by a glacier
  4. 11. large flightless bird
  5. 14. time between ice ages
  6. 16. humans
  7. 17. ancestor
  8. 19. process of becoming extinct
Down
  1. 1. walks on two feet
  2. 2. supporters of the multiregionalist theory
  3. 4. subspecies of humans
  4. 5. fossil sight
  5. 7. ancient fossils
  6. 9. Book written by Tim Flannery
  7. 10. handy man
  8. 12. ice age
  9. 13. artic plant
  10. 15. could walk upright
  11. 16. Primate family that includes humans
  12. 18. time when earth was frozen