So, how did bipedalism help our human ancestors overcome the problems of savannah life? Scientists previously thought that freeing the hands through bipedal walking immediately facilitated tool use and food transportation. However, it is now thought that the high energy efficiency of bipedalism was a more important factor.
■References (Books, papers, Web articles, etc.)
Origins Reconsidered: In Search of What Makes Us Human Richard E. Leakey Anchor; Reprint edition (October 1, 1993)
『ヒトはどのようにしてつくられたか』 山極寿一編 （岩波書店、2007）
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