对人类种群起源和分布的研究曾是基于考古和化石证据。
Study of the origins and distribution of human populations used to be based on archaeological and fossil evidence.
这不仅是对人类种群的研究，也是对非人类种群（包括病毒）的研究。
It's not only the study of human population, but the populations of non-human species, including viruses.
为什么我们是仅存的人类种群？
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