Part 1 of Essay
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 anthrop ....

Part 2 of Essay
.... to become a doctor. The same year, however, he transferred to Christ's College in Cambridge in order to become a clergyman. During this time he befriended a man of science, John Steven Henslow. It was Henslow who recommended him for the unpaid position of naturalist on the H.M.S. Beagle. Darwin set sail on December 27, 1831 to study the Pacific coast of South America and the Pacific Islands. His other duty was to set up navigation stations in the area. He also studied the geology and biology of these areas. ....