SCIENTISTS have long believed that the first humans evolved on the continent of Africa, and a new study appears to support this hypothesis. Experts took genetic samples over a 10-year period from communities all over Africa. They found that Africans have the most genetic variation among human beings.
21世纪报社版权所有，未经书面授权，禁止转载或建立镜像。 主办单位：中国日报社 Copyright by 21st Century English Education Media All Rights Reserved 版权所有 复制必究 京ICP备13028878号-12京公网安备 11010502033664号
京公网安备 11010502033664号
