Mutation

The Scars of Evolution Human bes, exchangeable all an new(prenominal)(prenominal) species on this planet, choose a history. We came into existence through a process of slow, craunch trial-and-error, occurring over geological time via the sieve of differential survival. And like all species, our bodies and our genes reflect and bear witness to that history. Far from existence perfect, one-time creations, we still bear the scars of the growthary process that made us. This crinkle will discuss some of the lines of evidence which hint at tender-hearteditys past. I wont repeat that well-known example of an evolutionary vestige, the kind appendix. Instead, Im going to focus on a few other examples that arent as widely discussed. Toes. Its only because were used to having toes that we dont usually convey how strange they are. Why do our feet have these stubby, non-functional digits on the ends? They offert grasp nearly as well as fingers, and we dont need them to proportionateness or to walk. (Why not just have a jumble front of the foot?) By contrast, anyone who observes other primate species plenty see that they have, not two hands and two feet, til now four hands, all of which are good for grasping. As homosexual beings gained the ability to stand and walk upright, our feet lost their grasping function, only the digits themselves, though now shrunken and largely useless, remain. Lanugo. This little-known developmental phenomenon is an crucial clue to our mammalian past. Lanugo is a coat of fine, downy copper color that fetuses grow while in the womb, covering the entire frame except for the soles of the feet and the palms of the hands. Typically, lanugo is shed by the seventh or eighth month of pregnancy, although premature infants may retain it for several weeks subsequently birth. The question is why we grow it at all, and the theory of evolution can easily explain this as a inherent characteristic retained from our furry ancestors. Goosebumps. Fitting neatl! y unitedly with lanugo is the vestigial human trait called the...If you want to get a full essay, order it on our website: OrderEssay.net

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