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Darwin's father entered him into a school of medicine at Edinburgh. Where he was removed for bad grades and could not stand the site of blood.
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Darwin had discovered several things about the biology of tiny marine organisms found along the Scottish coast. Not earth-shattering discoveries but this was his start as a Naturalist for Charles Darwin
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Darwin goes on the expedition on the Beagle, which travels all the way to South America where he studies insects and animals found there.
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Darwin returns home and starts creating his theories bases of the finds of his voyage.
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Charles Darwin began drawing out his theories on the development of the human species.
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Darwin goes publicly for the first time about his theory of evolution. And the order of Natural Selection.
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Darwin, Charles, 1809-1882. On The Origin of Species by Means of Natural Selection, or Preservation of Favored Races in the Struggle for Life. London :John Murray, 1859.
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Charles Darwin publishes "The Origin of Species" which is his entire thesis on the evolution of human beings through the process of natural selection.
https://youtu.be/UVx4Z3W6U-Y