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I agree that the T.rex would win

Considering that T.rex had perfect binocular vision, could smell up to 50 miles away and identify exactly what it was smelling and when it was there, could run up to 25 mph, had 60 teeth the size of daggers, weighed 8 tons or more, and could bite with the force of 20-50,000 pounds of pressure--I think the T.rex would win :).

^^