Sonar stands for “sound navigation and ranging.” what assumption was proved wrong after the invention of sonar?

The invention of SONAR disproved the old assumption that sound waves do not travel or propagate through water. The use of sound to echo-locate objects underwater was developed as a response to maritime disasters like the sinking of the Titanic.

The prehistoric carnivore could be a earlier species or ancestor of the other carnivores around it.

Explanation:

Due to the fossil being found in a deeper layer of rock it is believed that it would have died and fossilized before the other carnivores. With different features it could show a sign of evolution from that carnivore to the others.