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Dinosaurs first appeared on the planet around 230 million years ago, and most of them (I say most because birds are now classified as dinosaurs, due to recent studies) died out around 65 million years ago. they were the dominant vertibrate lifeforms on earth for 165 million years.
Wiki User
∙ 15y ago
Wiki User
∙ 14y agoSpecialists obviously disagree on the matter. Between 225 - 65 millions years ago seems a fair estimate. The longest rein so far.
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