Darwin is known as one of the greatest scientific thinkers as he discovered and later revealed some of the mysteries about science, which shocked most people at the time. Darwin based his study upon evolution by natural selection which consisted of four main topics that were very important to his study: Reproduction, Inheritance, Variation, and Differential Survivorship. Natural Selection is the process by which organisms vary throughout generation and as the environment changes, it becomes harder for species to survive if they do not inherit the specific trait needed. As this occurs, many characteristics become extinct. What made Darwin’s observations so unique was that he had interactions not only with the species he was experimenting on,
