7/31/2023 0 Comments Download free vestigial structuresThese vestigial eyes probably formed after hundreds or even thousands of years of living in total darkness. The pale fish has eyes, but as it is developing in the egg, the eyes begin to degenerate, and the fish is born with a collapsed remnant of an eye covered by flap of skin. In an experiment designed by nature, the species of fish known as Astyanax mexicanus, dwelling in caves deep underground off the coast of Mexico, cannot see. ![]() The Blind Fish Astyanax MexicanusĪstyanax Mexicanus: growing up in the wrong neighborhood. ![]() The drawback is that the wisdom teeth still want to come in, and when they do, they usually need to be extracted to prevent any serious pain. ![]() Now that humans brush their teeth twice a day, it's possible to keep one's teeth for a lifetime. A few thousand years ago, it might be common for an 18 year old man to have lost several, probably most, of his teeth, and the incoming wisdom teeth would prove useful. The second reason may have to do with dental hygiene. The first is that the human jaw has become smaller than its ancestors -and the wisdom teeth are trying to grow into a jaw that is much too small. ![]() There are two possible reasons why the wisdom teeth have become vestigial. But regardless of how much they are despised, the wisdom teeth remain, and force their way into mouths regardless of the pain inflicted. With all of the pain, time, and money that are put into dealing with wisdom teeth, humans have become just a little more than tired of these remnants from their large jawed ancestors.
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