If you ever get a chance to flip through Charles Darwin’s The Descent of Man, don't treat it as a piece of fiction. The book is about the body parts which might lose their importance in the coming future. Yeah, you read it right.
The underlying fact being that evolution has marooned a couple of organs without a purpose making them 'useless.' They might be of utter importance in the past, but going by the fact that homo sapiens are still evolving, such not so useful body parts might disappear in our future selves.
Here's a snippet of such body parts that may cease to exist due to lack of functionality.
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