Question

Scientists once believed that Tyrannosaurus rex dragged its tail along the ground. Today, they know that T. rex did not drag its tail but held it aloft, above the ground. This change in scientific consensus happened because

Answer 1

The idea that Tyrannosaurus Rex held its tail aloft was supported by the studies of many scientists.   This replaced the old idea that Tyrannosaurus Rex dragged it's tail all along the ground.   It was one of the best known dinosaurs which lived thousands of years ago in pre ancient history before civilisation of man.