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006; Carter, 1992; Hazan Zeifman, 1999; Taylor et al., 2000). Modern-day humans' hunter atherer ancestors lived in groups, as did almost all of the primates from which they developed (Lancaster, 1976). When it comes to trade-offs, a solitary lifetime avoids costs suchPerspect Psychol Sci. Author manuscript; out there in PMC 2011 August 25.NIH-PA Creator Manuscript NIH-PA Writer Manuscript NIH-PA

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