Extreme cold shapes human facial structure more than shared ancestry does
In short: Researchers who studied eight populations across East and North Asia found that mid-facial morphology is primarily shaped by climate rather than shared history. The study observed that the facial structures of North Asian groups are strongly associated with very cold and dry environments, contrasting with the more temperate features of East Asians.
The findings suggest that these physical traits are likely convergent adaptations to extreme weather. By accounting for genetic distances, the researchers showed that climate—specifically winter precipitation—remains the dominant factor in facial variation. However, the study is limited by its focus on modern populations, which may not perfectly mirror the evolutionary pressures faced by fossil hominins during past glaciations.
Why it matters: Understanding how humans adapt to extreme environments helps explain both modern diversity and the physical traits of our ancestors.
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