T-Rex (scientifically punctuated: T. rex) lived in the Cretaceous period, the 3rd and last of the Mesozoic Era and the final chapter on dinosaurs. The cretaceous ended rather suddenly 65 million years ago (MYA) -- with mass extinctions that seemingly wiped out all of the dinosaurs that weren't already extinct -- all at once, including T. rex. There's good evidence for an asteroid impact on earth causing the mass extinctions, though volcanism and other global phenomena have been put forth as explanations. Also, it's hard to tell from the fossil record whether the extinctions occurred over days or over centuries -- all we know is it was very brief on the long, long geologic time scale. In any case, the species T. rex was around for millions of years (I don't know exactly how long) and there's no reason to think it didn't get along just fine with its two powerful legs, balancing tail, and a crushing bite full of big, sharp teeth. Some paleontologists speculate that the puny forearms might have been used to assist copulation. Perhaps -- if T. rex had had more time to evolve -- the forelegs might have grown larger -- or disappeared altogether as vestigial limbs not worth the metabolic resources to maintain. Compared to most fossils and even most dinosaurs, there are few T. rex fossils for scientists to study, and complete skeletons are extremely rare. Perhaps future discoveries of more T. rex fossils will help shed light on the life of this extinct "king of the terrible lizards."

No it was because Marc Bolan had a car crash!

No, it died due to a cataclysmic meteor that nearly destroyed life for most of earth's species. I'm sure it lasted longer because it was a scavenger by nature and managed to live off carcasses like today's vultures and peck it's way to survival as is seen in today's chickens. T-Rex never was a hunter, but it was a bottom feeder of carrion and could claim any kill for its own due to its huge dental display.

No, they were wiped out in the same mass extinction/s that killed the rest of the dinosaurs living at the end of the Cretaceous period. For information on what caused the mass extinction/s, I'm sure there's a question about it somewhere.

No, it hasn't seemed to bother crocodiles all that much, adn T. Rex had HUUUUGE legs bulging with muscles so arms were pretty much just for holding dead meat.

No. The same thing that killed the other critters then also killed T-Rex.

No.it had no use for its arms.They died from the meteor impact,or they probibly would still rule today.

T-rex died out because sales of "Bang-a-gong" stoped. T. Rex the dinosaur died out because of the mass extinction of the dinosaur.

t-rex was considered at the top of the food chain. whatever killed it killed practically everything else too

Yes, it couldnt scratch its nose, and killed itself, all of them!