In the 19th century archeologists discovered the remains of extinct , highly developed primates called Dryopithecinae , or tree apes . Charles Darwin , the great English naturalist , and his followers analysed the evolution of the animal world over the course of many centuries and used these discoveries to scientifically prove the biological relationship between man and the animal world , as well as man’s evolution from the highly developed fossil apes . The proof of this theory was to be found in the data provided by anatomy , embryology , paleontology and , specifically , by the basic similarity of skel etal structure , brain development and the composition of the blood of modern man and the anthropoid apes . The develop ment of modern science has proved the validity of this mate rialist theory magnificently .