What century the dinosaurs roamed the earth?

Dinosaurs did not roam the Earth in a "century" but from from roughly 250 million (Triassic Period) to 50 million (Cenozoic Era) years ago.

A meteor hitting the Yucatan peninsula, about 60-70 million years ago, is theorized to have caused such global destruction immediately, and changed the climate so radically over the following millennia, that dinosaurs were eventually wiped out of the gene pool of the world.

Answer

Dinosaurs roamed the earth for around 180 Million years. They first appeared during the begining of the Mezoic Era, approximately 240 million years ago, and were wiped out at the end of Mezoic Era, approximately 75 million years ago, although some modern speicies may be descendants of dinosaurs.

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