An individual's understanding of himself must begin with an appreciation of his origin. Thus, the concern of modern man to understand his behavior has led to an investigation of the forces that influence human development. Investigation encompasses many academic subjects: genetics, biology, medicine, physiology, anatomy, biochemistry, sociology, anthropology, history, and psychology. However, each of these subjects falls into one or both of two broad categories-the biological and the cultural. In short, all human behavior is determined by both the biological characteristics and the...