Answer: The dinosaurs (except the birds) went extinct 65 million years ago, probably due to the ... How many teeth did T. rex have (and how big were they)?
Q: How many chambers did the Tyrannosaurus rex's heart have? from ?, ?, ?, ?; May 24 ... A: T. rex went extinct 65 million years ago in the K-T mass extinction.
T Rex ... Dinosaurs went extinct about 65 million years ago (at the end of the ... (1 calendar year), the dinosaurs appeared January 1 and became extinct the third ...