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
a. scientists liked the idea that T. rex held its tail aloft better.
b. no one supported the idea that T. rex dragged its tail on the ground.
c. the idea that T. rex held its tail aloft is an emerging idea that replaced the old idea.
d. the idea that T. rex held its tail aloft was supported by the studies of many scientists.

Answer 1

The answer is D. the idea that T. rex held its tail aloft was supported by the studies of many scientists 

Answer 2

The correct answer is d. the idea that T. rex held its tail aloft was supported by the studies of many scientists. This is how science works, things are discovered by having members of the scientific community do experiments and come to the same conclusion. Many of them confirmed this theory and a concensus was established.