Try to take a very long view of things, because an “extinction level event” is rarely an “event,” as you think of that word. There wasn’t one day where dinosaurs existed in the morning and were all dead by noon. Evolution is a process that takes place over l o n g periods of time.
So, how did, say, small mammals survive a meteor strike? Lots of possible reasons:
* They were on the other side of the planet.
* Their predators stopped reproducing at their previous levels.
* The food they relied on wasn’t negatively effected by whatever the event was.
Etc, etc.
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