Tyrannosaurus rex at the end of the Cretaceous

Tyrannosaurus rex lived in a time when many species of dinosaurs had already gone extinct.  T. rex was the last and biggest in a long line of tyrannosaurs.  T. rex had possibly the strongest bite of any species of animal ever to live on the Earth.  T. rex had a powerful sense of smell and could smell prey up to ten miles away.  T. rex also could see in high definition from a vantage point 18 feet (6 meters) up above the ground.  But things were looking grim at the end of the Cretaceous Period.  For a few million years the volcanic activity had gone up on Earth.  We can infer that sulfur dioxide was poisoning the atmosphere and killing off many of the species during the Late Cretaceous Period.  Carbon Dioxide would have been out gassing in many places as well.  Since CO2 is more dense than air T.rex's 18 foot tall height would have possibly protected it from suffocation from the CO2, whereas smaller or shorter dinosaurs would have suffocated and died.  CO2 is Carbon Dioxide and it can bind to the O2 or Oxygen receptors in animals' red blood cells.

Well, even with all those advantages T. rex could not survive the impact of a meteorite the size of Mt. Everest that hit what is now called the Yucatan Peninsula 65 million years ago.  In fact, there is some evidence of another, even larger impact in the Indian Ocean from the same time period. . . 65 million years ago.

Tyrannosaurus rex near a Volcano at the End of the Cretaceous