What was the very first dinosaur?

Dinosaurs went extinct around 65 million years ago after an asteroid crashed into Earth. So we know when dinosaurs disappeared from the planet, but when did they appear? What was the first dinosaur, and how long ago did it live? We asked paleontologist Kallie Moore to help us find the answer. Got a question that’s got you full of veloci-RAPTURE?  Send it to us at BrainsOn.org/contact, and we’ll TRY(ceratops) to answer it!