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By 1491, what was the estimated population of the Americas, and what are the three highly developed civilizations mentioned in the text?a) Between 10 million and 50 million people; the Mayas, the Aztecs, and the Incas.b) Between 50 million and 100 million people; the Mayas, the Aztecs, and the Incas.c) Less than 1 million people; the Iroquois, the Cherokee, and the Sioux.d) Over 200 million people; the Adena-Hopewell, the Hohokam, and the Anasazi.
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