When a new species evolves, it doesn't just show up fully formed. It takes many, many tiny mutations through many, many generations to gradually change a fin into a leg, for example, or to make a set of gills disappear. Don't believe us? You can find plenty of evidence right on your own body in the form of what are called vestigial traits. Here's a handful of body parts you have that are useless today, but once had a purpose.
Written by Ashley Hamer November 13, 2017
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