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 scientists liked the idea that T. rex held its tail aloft better. no one supported the idea that Trex dragged its tall on the ground 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.

## Step 1<br />The problem presents a scenario where the scientific consensus about the behavior of Tyrannosaurus rex (T. rex) has changed over time. Initially, it was believed that T. rex dragged its tail along the ground. However, this belief has been replaced by the idea that T. rex held its tail aloft, above the ground.<br /><br />## Step 2<br />The question asks us to identify the reason behind this change in scientific consensus. The options provided are:<br />- Scientists liked the idea that T. rex held its tail aloft better.<br />- No one supported the idea that T. rex dragged its tail on the ground.<br />- The idea that T. rex held its tail aloft is an emerging idea that replaced the old idea.<br />- The idea that T. rex held its tail aloft was supported by the studies of many scientists.<br /><br />## Step 3<br />The first option suggests that the change in consensus is due to personal preference, which is not a valid reason in scientific discourse. The second option implies that there was no support for the old idea, which is also not a valid reason for a change in consensus. The third option suggests that the new idea is an emerging one, but it doesn't explain why the old idea was replaced. The fourth option, however, states that the new idea was supported by many scientists, which is a valid reason for a change in scientific consensus.