Several other mass extinctions in the geological record have been tentatively identifiedwith large impacts, but none is so dramatic as the Cretaceous event. But even withoutsuch specific documentation, it is clear that impacts of this size do occur and that theirresults can be catastrophic. What is a catastrophe for one group of living things, however,40 may create opportunities for another group. Following each mass extinction, there is asudden evolutionary burst as new species develop to fill the ecological niches opened bythe event
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