Why didn’t the small post apocalypse survivor dinosaurs just refill the niches? Did the asteroid alter the planet in some way fundamentally different than the prior 200M years?
Edit: (collaborative clarification with my 5yo, with paraphrasing): Birds are boring dinosaurs. Why didn’t the big dinosaurs (non bird) come back? Why are there no mammal-sized (non bird) dinosaurs? (e.g., mouse through elephant-sized or even whale size)
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Because anything that wasn’t protected in some way burned. The impact shot particles into friggin space. Those particles, when they came back into the atmosphere, burned on reentry. There were so many that the atmosphere literally cooked just about anything exposed. It wasn’t just a big boom – it turned the whole planet into an oven.
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