Giving birth is difficult for human females because

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     bipedalism requires a narrow pelvis
      in humans the entire pelvis is fused
      the head of a human infant is so large
      human infants rotate during delivery
asked Jun 29, 2012 in Anthropology by anonymous
    

1 Answer

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bipedalism requires a narrow pelvis
answered Jun 30, 2012 by Bioshare ~Top Expert~ (34,070 points)



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