The document discusses three approaches to explaining deviance: physiological, psychological, and sociological. It focuses on the physiological approach, outlining Cesare Lombroso's 19th century theory that criminal behavior results from genetic defects, which he attempted to link to skull shapes and toe size. While some later studies found links between genetics and criminality, most did not and could not conclusively demonstrate that criminal behavior is determined by innate biological factors alone. The document also briefly mentions psychological theories linking personality traits like extroversion to crime.