What can kill a T-Rex in ease?

Question

What can challenge a T-Rex and beat it down, I mean whats another dinosaur that were located near/with the T-rex's at the time and the actual event happened where the 2 fought?

Is it considered the Best Dinosaur ever :D?

Answer 1

Time... it killed ALL the T-Rex's.

Answer 2

In the Cretaceous Period (130-65 million years ago), The T-Rex at 42 ft and 7 tons,was the largest dinosaur of its time. Also it was the most terrifying animal that ever walked the earth. To answer your question. Nothing in that era can kill a T-Rex. Like answer one said, time was the only thing that could kill it. Actually another aggressive female can kill a male t-rex since the female was larger and more aggressive. My answer is worth 10 points i think. LOL