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9 Fossil records show that speciation and extinction are influenced by interaction with other species and with the environment.
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6 A large artifact assemblage dating to 15,000 years ago lies beneath a Clovis assemblage in central Texas. Waters MR. (2011). Science 331: 1599-1603.
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5 Artifacts in eastern Arabia dating to 100,000 years ago imply that modern humans left Africa early, as climate fluctuated. Armitage SJ, et al. (2011). Science 331:453-456
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4 Analysis of x-ray microtomographic reconstructions of ammonite fossils reveal their feeding habits.
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