The radiation of dinosaurs refers to the rapid diversification and evolution of dinosaur species that occurred during the Mesozoic Era, particularly after the End-Triassic extinction event. This event wiped out many competing species, allowing dinosaurs to occupy various ecological niches and evolve into a wide range of forms, from small theropods to massive sauropods. The radiation is significant as it marks the rise of dinosaurs as dominant terrestrial vertebrates, leading to their eventual global distribution.
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