Ball State Deac
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But, to answer your question, in a very basic way, homo erectus (primitive, yo), goes back about 2m years.
The reign of the reptilian terrestrial dinosaurs we usually think of (T Rex. etc.) ended with the Cretaceous-Paleogene extinction event, which occurred 65.5m years ago. After that, we had the rise of the mammals. Mammoths, cats, dogs, and (eventually) us.
But wait, the planet is only 6,000 years old. Does not compute.