Mutation

The Scars of Evolution Human bes, wish all an early(a)(prenominal) species on this planet, call for a history. We came into existence through a process of slow, abrasion 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 universe perfect, one-time creations, we still bear the scars of the growingary process that made us. This keep 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 miscellanea 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 shoot how strange they are. Why do our feet have these stubby, non-functional digits on the ends? They offert storage area nearly as well as fingers, and we dont need them to ba lance or to walk. (Why not just have a immix front of the foot?) By contrast, anyone who observes other primate species tooshie see that they have, not two hands and two feet, heretofore four hands, all of which are good for grasping.

As tender-hearted beings gained the ability to stand and walk upright, our feet lost their grasping function, ostensibly the digits themselves, though now shrunken and largely useless, remain. Lanugo. This little-known developmental phenomenon is an life-and-death clue to our mammalian past. Lanugo is a coat of fine, downy fuzz that fetuses grow while in the womb, covering the entire clay except for the soles of the feet and the palms of the ha nds. Typically, lanugo is shed by the sevent! h or eighth month of pregnancy, although premature infants may retain it for several weeks later birth. The question is why we grow it at all, and the theory of evolution can easily explain this as a underlie characteristic retained from our furry ancestors. Goosebumps. Fitting neatly together 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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