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.
7 Useless Body Parts You Didn't Know You Had
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Key Facts In This Video
At certain stages of development, human embryos have "tails" that are eventually absorbed and fused into vertebrae. 00:27
Some scientists believe that the plica semilunaris is a remnant of a third eyelid. 01:52
Around 37% of babies can support their entire body weight by grasping onto something. 02:23
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