Vestigial body parts are are of little to no use to us today, but were once important traits that played significant roles in our evolutionary history. Your tailbone, for example, is a vestigial reminder that our ancestors had tails. (Most mammals have a tail at some point in their lives, even if it's only for a brief time in the womb. Human embryos have "tails" during certain points of development that are eventually absorbed and fused into vertebrae.) Male nipples, wisdom teeth, goosebumps, plica semilunaris, and some parts of the ear are similarly "useless" features.
You Have Plenty Of Useless Body Parts
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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