题目选项分析

The homogeneity of the human genetic record, which is said to be consistent between individuals to one part in ten thousand, has heretofore been attributed to environmental factors; the theory of convergent evolution, however, may also be able to explain it.

The homogeneity of the human genetic record, which is said to be consistent between individuals to one part in ten thousand, has heretofore been attributed to environmental factors; but it may be equally accounted for by the theory of convergent evolution.