Evolutionary theory is developed from Darwin's argument which "suggests that a process of natural selection leads to the survival of the fittest and the development of traits that allow a species of adapting to its environment. . “Many have gone further to argue that our genetic inheritance determines not only our physical traits, but also certain personality traits and social behaviors. There is so much controversy over which behaviors are important because many believe we are already a pre-programmed human species. It has also been argued that evolution is reflected in the functioning and structure of the nervous system and that it involves evolutionary factors that have a significant influence on everyday behavior. What is said means that if we follow evolutionary theory, then we will say that we are already pre-programmed before birth to follow certain protocols in life. Whether by finding a partner or finding a job. This theory was also believed to give clues to follow from our own system, providing us with certain aspects of the lives of our ancestors. By believing in this theory, we can determine the importance of heredity in influencing human behavior. Behavioral geneticists and evolutionary psychologists have both agreed that genetic factors not only provide specific behaviors or traits, but they also show the limits to the emergence of such traits or behaviors. What this means is that our genetics will determine how tall we are and how unique we will all be in our own way and at some point we will realize our potential and try to achieve more, not that our genes will make us have forced us to act as we do. Evolutionary theory also holds that we are not in control of ourselves when it comes to free will, whereas humanism believes that everyone is capable of making their own decisions. Evolutionary theory also suggests that some people's personalities remain stable throughout their lives, while humanists believe that personality is flexible and resilient throughout their lives. (Feldman, 2009; p. 401-402) (Feldman, 2009; p. 401-402) ¬Essentials of Understanding Psychology, 8th edition Robert S. Feldman McGraw-Hill Higher Education, 2009 Pages 8-9, 64-65 and 328