They didn’t all die at the time of the impact… it was similar to a volcanic explosion, except instead of smoke and ash, it just filled the air with so much dirt (like a dust storm) that it literally blocked out the sun. In some places the dirt in the air was so thick that creatures would have suffocated. In other places, there were widespread famines as plants died and food became scarce.
It was literally years without sunshine across huge areas.
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