Biological determinism refers to the idea that all human behavior is innate, determined by genes, brain size, or other biological attributes. This theory stands in contrast to the notion that human behavior is determined by culture or other social forces. Inherent to biological determinism is the denial of free will: individuals have no internal control over their behavior and dispositions, and thus are devoid of responsibility for their actions. Often implicit in this line of reasoning is the idea that because humans lack responsibility for determining their own lives, they are rightfully subject to the control of persons biologically determined in more socially acceptable ways. While few biologists fully believe in the idea of biological determinism, the theory has had cultural and political currency both in the shaping of human racial history and in current debates over the relative importance of our genetic qualities (i.e., nature) versus our socialization process (i.e., nurture) in determining our individual physical and behavioral characteristics