Darwin’s theory of natural selection has greatly affected how scientific thinkers look at the world today, during his time, he may not have been able to prove the theory, but with all the technological innovations of today, it has become much simpler for us to prove his theory using genetic and DNA, his theory has helped us find us to many questions, for instance his theory has allowed scientists to understand how inheritance and variation work (GCSE Bitesize, 2014). The physical environment also has a hand in human variation, it causes the variation that occurs amongst individuals which have different life experiences in their own specific environment, the environment does this by restricting and promoting growth and development, this also …show more content…
Although the Australopithecines were anatomically similar to humans from the neck downwards, their heads had significant differences, in several key features, to that of humans, thus causing the size of the adult brain to be third of that of people today, this resulted in the part of the skull below the brain case being the widest part (O’Neil, 2012). These hominids faces were large compared to the size of their brain cases, this was because they had big molar teeth with thick enamel, but their front teeth were smaller, they had large jaws, as well as powerful jaw muscles, the size and shape of these jaw muscles is shown by flaring cheek bones, the faces of these hominids were also concave and projecting forward at the bottom because of their small brain cases and large teeth and jaws , and also possessed no dental arcade and diastema like the apes(O’Neil,