Homo evolution may have orbited around Earth’s movements.
Paleoanthropologist Rick Potts of the Smithsonian Institution in Washington, D.C., has developed another influential theory about how climate fluctuations influenced human evolution that’s still open to debate. A series ofevolving as a species with a keen ability to survive in unpredictably shifting environments, Potts argues .
The new findings need to be compared with long-term environmental records at several well-studied fossil sites in Africa and East Asia before rendering a verdict on variability selection, Potts says. The new model “provides a great framework” to evaluate ideas such as variability selection, says paleoclimatologist Rachel Lupien of Lamont-Doherty Earth Observatory in Palisades, N.Y.
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