Were Aboriginal Australians hunter-gatherers?

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Across
  1. 2. a member of a nomadic people who live chiefly by hunting and fishing, and harvesting wild food.
  2. 4. detailed examination of the elements or structure of something.
  3. 6. refined and well educated.
  4. 9. deny the truth of (a statement) by asserting the opposite.
  5. 10. harmful to someone or something; detrimental.
  6. 14. an expert in or student of anthropology.
  7. 16. preconceived opinion that is not based on reason or actual experience.
  8. 17. a formal religious or public occasion, especially one celebrating a particular event, achievement, or anniversary.
  9. 18. obtain (food or provisions) by searching
  10. 20. an amount of something left over when requirements have been met; an excess of production or supply.
Down
  1. 1. supply water to (land or crops) to help growth, typically by means of channels.
  2. 3. an amount of something left over when requirements have been met; an excess of production or supply.
  3. 5. the science or practice of farming, including cultivation of the soil for the growing of crops and the rearing of animals to provide food, wool, and other products.
  4. 7. a thing that is accepted as true or as certain to happen, without proof.
  5. 8. the process or period of gathering in crops.
  6. 11. involving many carefully arranged parts or details; detailed and complicated in design and planning
  7. 12. a settler in or inhabitant of a colony.
  8. 13. send settlers to (a place) and establish political control over it.
  9. 14. an impressive display or range of a particular type of thing.
  10. 15. higher in rank, status, or quality.
  11. 19. Aquaculture is breeding, raising, and harvesting fish, shellfish, and aquatic plants.