List the 4 basic principles of genetics that mendel discovered in his experiments. briefly describe each princeiples.
Results showed T. rex was heavier than previous estimates, which ranged from about 4.5 tons to 6.5 tons, with the Field Museum's Sue skeleton weighing a heaping 9 tons (about 8,164 kilograms). [ Gallery: The World's Biggest Beasts ].
The largest known Tyrannosaurus rex skulls measure up to 1.45 meters (4.8 ft) in length. Large fenestrae (openings) in the skull reduced weight and provided areas for muscle attachment, as in all carnivorous theropods.