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Findings in biological anthropology suggest that Native Americans' ancestors probably came to the Americas from northeastern Asia. Turner, for example, has studied the dentition of prehistoric and living Native Americans and northeastern Asians. Based on approximately twenty dental traits, including tooth-crown shape and number of roots, he has defined an overall dental pattern called Sinodonty, which includes three-rooted lower first molars and shovel-shaped incisors. This distinctive pattern is shared among most Native Americans and people from northeastern Asia, but is not found in people who originated in southern Asia, Africa, or Europe. Another less complex pattern—Sundadonty—is shared among the people of southeastern Asia and is also found in prehistoric American populations, but Turner believes that widespread Sinodonty demonstrates most Native Americans' northeastern Asian origins.
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当前版本由 371524c 更新于2020-04-22 16:33:48 感谢由 371524c 对此题目的解答所做出的贡献。
答案：BC。多选题。
根据题干定位到Sinodonty，“he has defined an overall dental pattern called
Sinodonty, which includes three-rooted lower first molars and shovel-shaped incisors.(此处对应B )This distinctive pattern is shared among most Native Americans and people from northeastern Asia, but is not found in people who originated in southern Asia, Africa, or Europe. ”得出答案C。
A选项错，因为Sundadonty并不是Turner的发现。
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Orange Ao
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没有证明，A这个traits是被SOUTH的人共有的而不是NORTH
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