Darwin volunteered without any salary and offered to pay his own expenses on the condition that he was allowed to keep all the plants and animals he collected. During the journey he noted that in the different environments that he visited changes occurred in the same species that helped them to adapt to their surroundings. It was as a result of these observations of other naturalists and geologists that Darwin began to formulate his theory of evolution known as "Natural Selectney. In his return, he was convinced that the earth was extremely old and its evolution was the result of many small changes.
The reason why i picked Charles Darwin was because he was a real genius. Thanks to him the whole world knows the "Theory Of Evolution." Also because even though everyone ecxpected him to follow his fathers footsteps and become a well known doctor he decided to follow his calling which was to learn about nature.