Who used the scientific discoveries of the 1800s as a basis for his philosophy and applied the study of evolution to the academic disciplines of biology, sociology, psychology, and other areas?

Herbert Spencer was the philosopher and scientist of the XIX, who applied the studies of evolution to the branch of biology and psychology, among others. Herbert Spencer was an English philosopher and sociologist. He developed an idea of evolution as the progressive development of the physical world, biological organisms, and the mind.