When I hear the term hunter gatherer I imagine anatomically modern humans living in such a social structure. I don’t think the term is often used to describe our pre-human ancestors (although it may be an apt descriptor of how they lived). If we’re talking about our pre-human ancestral social structures that needs to be clarified and if we’re talking about homo sapien social structures it’s not relevant from a biological standpoint unless the brain evolved during that time span.
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