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4. Dinosaurs lived through several periods

There was not just one period where dinosaurs roamed the earth. Their earliest appearance was during the Triassic Period. The Jurassic period came later, followed by the Cretaceous Period. What does this mean? Many of the dinosaurs you commonly think of were not alive during the same period. The Stegosaurus was extinct for over 60 million years before Tyrannosaurus Rex roamed the planet.

Stegosaurus dinosaur fossil skeleton on display at the Field Museum ChicagoPhotographer / Shutterstock.com

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