Charles Darwin, a British naturalist, revolutionized biology with his theory of evolution through the process of natural selection. Herbert Spencer was the major philosopher of biological and social evolution. Spencer's work significantly influenced 19th century developments in biology, psychology, sociology and anthropology. While Darwin was influential in the fields of natural history and geology, his theory of evolution created great controversy. He changed the way people thought about the role of humans in the natural …showed first 75 words of 1227 total…

…showed last 75 words of 1227 total…the study of evolution. Their theories are still in existence today and have not been discounted. Spencer mostly dealing with society and Darwin with nature. They both are famous for their theories of evolution, but their theories differ. Darwin felt that evolution was gained through natural selection. However, Spencer believed in survival of the fittest in order to create a heterogeneous society. Both men's writings and theories became greatly controversial, but greatly influenced future scientists.