Why Do Cave Fish Lose Their Eyes

Scientific Evidence Proves use it or Lose it is a Thing of the PastLamarck and Darwin some(prenominal) believed that giraffes developed long necks because that is what they use to take on the leaves high above trees Lamarck s possibleness is that because their (giraffes ) forebears were continually stretching to micturate the higher leaves in trees . The desire to reach higher leaves take to longer necks , and later on , the giraffe s offspring transmittable that physical trait (Natural account , 2005 ,.46 Darwin disagrees with Lamarck when his theory of natural survival of the fittest stated that the giraffes with longer necks outlived the ones with shorter necks maybe because the more nutritious leaves were at the higher parts of trees . However , when Lamarck said that unused organs shrivel until they fly (Natural History , 2005 ,.46 ) Darwin was at a red ink since his theory of natural selection cannot explain regressive exploitation and he finally succumbed to Lamarck s use it or lose it linguistic ruleDarwin , disregarding of how gr have a scientist he is , is not infallible Robert Simmons has of late voiced out a contradictory view of both Darwin and Lamarck s theory of why giraffes have long necks . Simmons believes that contention for friction match and not stretching for treetop food is what drove the exploitation of necks . According to his observations when male giraffes battle for mates , they swing their necks of everywhere 6 feet long and weighs over 200 lbs . The momentum of these swings be often lethal , therefore , it is only natural that the overlord is the one who possesses the longest and biggest neck . He goes on to presuppose that if the competition for food is what spurred the elongation , then you would expect giraffes to eat the leaves from tall acacia trees rather than grazing on low shrubs (Discover , 1997 ,.

14If Simmons theory disproves Lamarck s conclusion that the stretching of the neck was due to food competition , then it can be said that the principle of Use it or Lose it can be disproved . To know if whether this principle is still steadfast , we have to consider both sides of the spectrumThe of import proponent of Lamarck s use it or lose it theory is the neutral- version scheme . According to this hypothesis , genes controlling the development of unnecessary structures operate effectively neutral . Once the genes neither enhance nor block up the organism s survival , the forces that once maintained those genes in pricey working no longer operate . The genes accumulate mutation that impair their function , and so the unnecessary genes degenerate (Natural History , 2005 ,.47 . Careful analysis of the use it or lose it scenario shall happen one to believe that if an organ is not anymore involve , it shall degenerate and sooner or later entirely disappear without any effect on the organism except for the overtaking of an unnecessary partA group of scientists that holds a contrary view believes that the way out of one part is due to regressive evolution and not...If you fatality to get a full essay, order it on our website: Orderessay

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