The idea of vestigial organs has been passed on for over 100 years. Vestigial organs are said to be remnants of organs that were used by an organism's ancestors but are no longer needed, or they function in a reduced capacity in the modern organism. The human appendix is one of the most used, or misused, examples. Just because we do not understand the function of an organ doesn't mean that it serves no function. The appendix was thought to be an evolutionary leftover, but today we know it serves an important immunological function. Most of the organs that were once thought to be vestigial have been shown to have functions.
Here is an great example. Evolution says, "Vestigial structures, such as pelvic bones in the baleen whale, are evidence of evolution because they show structural change over time."
Here is a rebuttal on this. The pelvic bone in whales serves as an important anchor for muscles of the reproductive organs. Contrary to the claim, a structure cannot "show structural change over time." The change over time must be inferred from assumptions about the fossils record and evolution. To know if an organ is vestigial, you must know its ancestors and exactly how the organ was used by those ancestors.
https://www.youtube.com/watch?v=LgDaViPUfZY
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