(via PBS Eons) An asteroid impact triggered the K-Pg mass extinction, wiping out the non-avian dinosaurs, ending the Age of Reptiles, and ushering in the Age of Mammals. But why was it the mammals who ...
MSRLSI copy gift of Dr. George R. Zug and signed by author VPAL copy gift of the author; signed by the author and inscribed for the NMNH Library "Over 300 million years ago, an early land vertebrate ...
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