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19. If instead of specialized doctors (neurologists, cardiologists, gastroenterologists, etc.) we had doctors who each knew the same things about all aspects of medicine, it would be:A) better because then we could just go to one doctor with no loss of quality in medical care. B) better because total medical knowledge in society would increase. C) worse because the human brain is limited. D) worse because total medical knowledge in society would decrease. 20. Roses grown in Kenya travel to Amsterdam and ultimately to your local flower shop because:21. Trade barriers like the Berlin Wall:22. A rock carving from ancient Norway depicts two identical people doing different jobs in the same boat: one uses a bow to hunt while the other paddles. How does this early example illustrate the benefits of trade?