What are rudiments? Can data on vestigial organs be used to prove human animal origin?

Rudiments are organs that are laid in embryonic development, but are not fully developed in an adult organism and have lost their significance in the course of evolution. The presence of rudimentary organs in humans proves its relationship with other representatives of the animal world. An example of such organs in humans is the tailbone and ear muscles. The presence of the tailbone or tail vertebrae suggests that human ancestors had tails, and our ancestors needed the ear muscles in order to better recognize the source of noise, that is, danger.