Skeleton of a young dinosaur. Approximately 700 species of dinosaurs have been named. Dinosaurs lived during the Mesozoic Era, which includes the Triassic, Jurassic, and Cretaceous Periods. Their extinction can be attributed to a meteorite impact, release of volcanic gases, climate cooling, sea-level change, low reproduction rates, poisonous gases from a comet, and changes in the Earth's orbit or magnetic field.

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