Dinosaurs: T. rex had more powerful jaws than its theropod ancestors
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Theropod dinosaurs, including carnivores like T. rex and herbivores like Therizinosaurus, evolved deeper and stronger jaws over the course of the dinosaur age
Dinosaur - Theropods, Extinction, Fossils
T. Rex's Tiny Arms May Have Been Vicious Weapons – National Geographic Education Blog
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T. rex may have hidden its teeth behind lips
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