All Y chromosomes in existence today are descended from a single ancestor's who is thought to have lived about 140,000 years ago.
-
Aa single ancestor's who is thought to have lived
分析该选项
-
Ba single ancestor's who was thought to live
分析该选项
-
Ca single ancestor whom it is thought had lived
分析该选项
-
Dthe Y chromosome of a single ancestor who is thought to have lived
分析该选项
-
Ethe Y chromosome of a single ancestor whom it was thought had lived
分析该选项
显示答案
正确答案: D