Scientists once believed that tyrannosaurus rex dragged its tail along the ground. today, they know that t. rex did not drag itstail but held it aloft, above the ground. this change in scientific consensus happened becauseo scientists liked the idea that t. rex held its tail aloft better. o no one supported the idea that t. rex dragged its tail on the ground. o the idea that t. rex held its tail aloft is an emerging idea that replaced the old idea. the idea that t. rex held its tail aloft was supported by the studies of many scientists.

Hello!

The correct answer is D.

We know that scientific discoveries are constantly getting updated and renewed, both of which have nothing to do with liking one idea more than another. We also know that some scientists did support the idea that the T-rex dragged its tail, so A and B are both wrong. What makes C wrong is that studies must be supported in order to emerge, which is exactly what D states. All scientific discoveries must be backed up by numerous studies in order to be considered valid.

I hope I helped!

when it is at an intermediate population density