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
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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