history of dinosaur
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Answer:
245 million years ago
Dinosaurs are a group of reptiles that first appeared about 245 million years ago. They dominated the planet until an extinction event wiped out a large swath of life on Earth about 66 million years ago. But now we know that the Age of Dinosaurs never ended. Instead, a group of dinosaurs gave rise to a new, small airborne form: birds.
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Answer: The prehistoric reptiles known as dinosaurs arose during the Middle to Late Triassic Period of the Mesozoic Era, some 230 million years ago. They were members of a subclass of reptiles called the archosaurs (“ruling reptiles”), a group that also includes birds and crocodiles
Earth was hit by an asteroid or comet some 66m years ago at the end of the Cretaceous period. But that was either a coincidence or the straw that broke the planet's ecological back. For the rocks also show that a series of huge volcanic eruptions was happening at the time in what is now India.