Had the non-avian dinosaurs not been wiped out 65 million years ago, our species would probably never existed. The mass extinction that struck at the end of the Cretaceous was one of the major events in earth's history that greatly affected evolution by pruning back the tree of life, and it was in the wake of the extinction that mammals became the dominant vertebrates on land. What scientists have been trying to figure out, however, is why mammals survived while the dinosaurs perished.
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