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Articles - Plant and Animal Sciences

Francisco J. Ayala Department of Ecology and Evolutionary Biology University of California, Irvine Irvine, Calif. " The pelvis of Lucy, a three-million-year-old hominid, reveals that she was already quite adept at walking upright. Bipedality evolved very early in human evolution because it enabled males to nurture a family: It freed their hands to carry food. C.O. Lovejoy, "Evolution of human walking," Scientific American, 259 (5), 118-25, November 1988. " The oldest fossil record of terres

The Scientist Staff

Francisco J. Ayala
Department of Ecology and Evolutionary
Biology
University of California, Irvine
Irvine, Calif
.

" The pelvis of Lucy, a three-million-year-old hominid, reveals that she was already quite adept at walking upright. Bipedality evolved very early in human evolution because it enabled males to nurture a family: It freed their hands to carry food.

C.O. Lovejoy, "Evolution of human walking," Scientific American, 259 (5), 118-25, November 1988.

" The oldest fossil record of terrestrial animal life in North America is a bristletail insect from the Early Devonian. It had large, bulging, separated, compound eyes; monocondylic mandibles; and numerous sensory setae. This fossil shows that early hexapod diversification occurred on the land contemporaneously with the emergence of the first vascular plants during the Silurian.

C.C. Labandeira, B.S. Beall, F.M. Hueber, "Early insect diversification: Evidence from a lower Devonian bristletail from Quebec," Science, 242 (4880), 913-6, 11 November 1988.

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