All human relations are rooted in the laws of nature. Humans tend to view themselves as unique, not only different from but also more important than any other species. In contrast, Darwin’s theory of evolution presented the human as an integral part of all nature, subject to the identical evolutionary forces that govern all other living things. Bowen (1978) developed a theory of human behavior that was based on the human as part of evolution. According to Bowen, evolution explains not only the physical similarity between humans and other animals but the behavioral similarity as well (Kerr and Bowen, 1988).