It had been believed for a long time that all living things on earth came in individually. Charles Darwin, naturalist and geologist, came up with the evolutionary theory, which proved that all living beings have survived only because of evolution. He argued that natural selection has helped us survive through the changing environments throughout history. The book changed the world’s understanding of their environment and history, and has even challenged the strong belief in divine creation. Darwin's book is essential for and has influenced scholars in fields of philosophy, theology and history.