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Effects of Past Global Change on Life (1995) / Chapter Skim
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Pages 235-235

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From page 235...
... DEVELOPMENT IN APES, HUMANS, AND AUSTRALOPITHECINES Estimates of brain volumes, body weights, and pelvic dimensions lead to the conclusion that the infants of early Homo were physically helpless, like those of modern humans (Stanley, 1992~. A key fact underlies calculations leading to this conclusion: all primates adhere to the same general curve when their brain weights are plotted against their body weights for the fetal interval: brain weight constitutes roughly 10% of body weight (Holt et al., 1975~.
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Key Terms

  • modern humans
  • body size
  • gracile australopithecines
  • brain growth
  • environmental changes

  • postnatal interval
  • gracile australopithecine


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