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Historically speaking, these marked changes in the face occurred at a time when the emergence of important social changes began to take place—mainly, the collaboration between distantly related groups of humans. This was a time when modern human groups began to exchange gifts <https://www.openquaternary.com/articles/10.5334/oq.ai/> across large regions. Being able to create distant friendships probably helped early humans to colonize new environments, as they had friends they could rely on and retreat back to. Modern humans also lived in larger and more diverse groups than previous species <http://science.sciencemag.org/content/331/6022/1286>, thereby reducing interbreeding. So the impacts of friendly and mutually supportive relationships with people outside one’s own group were far-reaching. And the development of mobile eyebrows may have been a key part of all these changes. https://www.sapiens.org/evolution/human-eyebrow-evolution/ _________________________________________________________ Full posting guidelines at: http://www.marxmail.org/sub.htm Set your options at: http://lists.csbs.utah.edu/options/marxism/archive%40mail-archive.com
