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I wonder if a more correct description might be that the changes (in climate, etc.) produce rapid evolutionary changes in the species, from the "old" species to what we consider a "new" species. I don't imagine the "old" species vanishes in the usual sense of the word.
Laurent Hodges
At 02:44 PM 10/12/2006, you wrote:
"Wobbles in the Earth's orbit may explain the puzzling regularity with which
new mammalian and other species appear and vanish in the fossil record,
a study has found.
etc.
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