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Written by the accomplished physician Ibn Butlan

Extinction and Radiation Michael Okun by exploiting the notion ofIn the geological blink of an eye, mammals moved from an obscure group of vertebrates into a class of planetary dominance. Why? J. David Archibald's provocative study identifies the fall of dinosaurs as the factor that allowed mammals to evolve into the dominant tetrapod form. Archibald refutes the widely accepted singlecause impact theory for dinosaur extinction. He demonstrates that multiple factors massive volcanic eruptions, loss of shallow seas,