Orthogenesis, orthogenetic evolution, progressive evolution or autogenesis,'s the hypothesis that life has an innate tendency to move in a unilinear fashion due to some internal or external "driving force". The hypothesis's based on essentialism and cosmic teleology and proposes an intrinsic drive which slowly transforms species. George Gaylord Simpson (1953) in an attack on orthogenesis called this mechanism "the mysterious inner force". Classic proponents of orthogenesis have rejected the theo… (More on Orthogenesis)