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References and Resources
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Gibbons, Ann. February 15, 2002. In search of the first hominids. Science, vol. 295, p. 1214. Several types of hominids lived just before the australopithecines.

Lewis, Ricki. 2000. Discovery: Windows on the Life Sciences. Malden, Mass.: Blackwell Science.

Chapter 2 offers an extensive analysis of evidence about events at the dawn of life.

Margulis, Lynn, Dorion Sagan, and Ernst Mayr. 2002. Acquiring Genomes: A Theory of the Origin of Species. New York: Basic Books. DNA in early organisms was likely "promiscuous." Snyder Sachs, Jessica. 2001. Corpse. Cambridge, Mass.: Perseus Publishing.

Chapter 7, "The Witness Was a Maggot," includes a wonderful history of the idea of spontaneous generation.

Tattersall, Ian. January 2000. Once upon a time, H. sapiens may not have been the only hominid. Scientific American, vol. 282, p. 56. Modern humans may have emerged the sole survivor(s) among several types of ancestral hominids.

Wood, Bernard. July 11, 2002. Hominid revelations from Chad. Nature, vol. 418, p. 133. Discovery of a skull from Sahelanthropus tchadensis set back the time of hominid origin 5 million years.

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