Mutation

The Scars of Evolution Human bes, similar all an some other(prenominal) species on this planet, drive 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 creation perfect, one-time creations, we still bear the scars of the phylogenyary process that made us. This differentiate 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 chassis 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 mystify how strange they are. Why do our feet have these stubby, non-functional digits on the ends? They offert wait nearly as well as fingers, and we dont need them to proportionateness or to walk. (Why not just have a amalgamate front of the foot?) By contrast, anyone who observes other primate species hind end see that they have, not two hands and two feet, merely four hands, all of which are good for grasping.

As adult male beings gained the ability to stand and walk upright, our feet lost their grasping function, obviously 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 grunter that fetuses grow while in the womb, covering the entire ashes except for the soles of the feet and the p alms of the hands. Typically, lanugo is shed! by the seventh or eighth month of pregnancy, although premature infants may retain it for several weeks after birth. The question is why we grow it at all, and the theory of evolution can easily explain this as a cardinal 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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