A plot of data on life extinctions, collected by Raup and Sepkoski at the University of Chicago, shows peaks in the extinction rate occurring at 26- to 30-million-year intervals, as indicated by arrows. Source: Lawrence Berkeley National Lab
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A plot of data on life extinctions, collected by Raup and Sepkoski at the University of Chicago, shows peaks in the extinction rate occurring at 26- to 30-million-year intervals, as indicated by arrows. Source: Lawrence Berkeley National Lab |
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