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What if a giant asteroid had not wiped out the dinosaurs?

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A 66 million -year-old asteroid hit Earth 66 million years ago , killing 75% of species on Earth .

Paleontologists say it's possible that dinosaurs would have continued to evolve and rule Earth .

Some dinosaurs may have lived in frigid conditions, such as ice ages, the majority didn't.

The extinction of land-dwelling dinosaurs gave our primate ancestors the opportunity to thrive and evolve, a study found.

If the asteroid had missed Earth , it's likely that humans, at least as we know them, never would have existed.

"History would have been totally different," Brusatte said.