そせん
ancestor; predecessor
noun
我々人類の祖先は、数百万年前にアフリカで誕生したと考えられています。
It is believed that our human ancestors were born in Africa millions of years ago.
DNAの比較研究により、異なる民族の祖先が共通の源を持つことが明らかになりました。
Comparative DNA research has revealed that different ethnic groups share a common ancestral origin.
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