Why does the author mention blood types in par
问题详情
Why does the author mention blood types in paragraph 3？
A．Blood types offered proof that the migration had come from Scandinavia.
B．The presence of type B in Native Americans was evidence of the migration.
C．The blood typing was similar to data from both Japan and Scandinavia.
D．Comparisons of blood types in Asia and North America established the date of migration.请帮忙给出正确答案和分析，谢谢！
参考答案
正确答案：D
解析：... the migrations must have begun before the evolution of type B." Choice A is not correct because the time frame. was the same as the settlement of Scandinavia, but the origin of the migration was not Scandinavian. Choice B is not correct because almost no Native Americans have type B. Choice C is not correct because the blood typing was done with Native Americans and Asians, not Scandinavians.
