The Evolution of the Human Being

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The very first big difference was the shape of our brain that is different than those our predecessors. That this is so is illustrated by the Dikka baby who "from the waist down.. looked like us.. One of her humanlike knees was complete with a kneecap no bigger than a dried pea. But her upper body had many apelike features" (152). The Dikka baby showed the first signs of a hyoid bone that later developed into the tool for human speech. She was developing into the humans that we are today. The rest of her upper body, however, was like Lucy's, the famous Australopithecus hominid. Her brain was small, her nose flat like a chimpanzee's, and her face was long and projective" (ibid). Her finger bones too almost resembled those of a chimp's and her two shoulders represented those of a gorilla. It was her smaller brain that provides the clue. As the DVD 'Becoming human" shows, Lucy's brain was diametrically different that those of her predecessors. It was slightly bigger. The brain's growth then signals growth in capacities, hence growth in development and increased success in survival. It also made these apes different than those who preceded them. "The Dikla baby," for instance, " was a distinctly different creature from the apes that her ancestors had diverged from several million years earlier." (p. 158). The question, however, is: what led to the growth and modifications in the brain? Some paleontologists suggest that sharp swings of climate contributed to the change.
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