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The dinosaurs existed as they evolved best to fit the ecological niches of the day.
Wiki User
∙ 15y ago
Wiki User
∙ 13y agoDinosaurs existed for the same reason that any other animal has existed or does exist. They evolved, and were well enough adapted that they survived for millions and millions of years.
Wiki User
∙ 10y agoDinosaurs evolved from earlier reptiles (archosaurs) about 230 million years ago.
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