Chapter 1 - Nature, Humanity, and History, to 3500 B.C.E.

Very early human groups likely exhibited some primate traits, but long before the advent of modern Homo sapiens the two-parent family would have been common. The need of human infants and children for much longer nurturing makes care by mothers, fathers, and other family members a biological imperative. ... Chapter 1 - Nature, Humanity, and ... ................
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