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helps students answer questions about dinosaurs: What makes a dinosaur "a dinosaur"? Where did they live? What caused their mass extinction? Students can participate in a virtual dinosaur discovery, follow milestones in dinosaur evolution, and see behind-the-scenes slideshows of the lab environment where vertebrate specimens are prepared for exhibits and research. (National Museum of Natural History, Smithsonian Institution)
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The most basic division of dinosaurs is into two groups: Saurischia and Ornithischia. The two groups first appeared at the start of the Late Triassic Period, and both survived until the end of the Late Cretaceous. |
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Tyrannosaurus |
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