The Out-of-Africa replacement model proposes a simian origin of humanity from tree dwelling ancestors, then single and relatively recent transition from archaic hominins to anatomically correct humans in Africa, followed by a later migration to the rest of the world, mutating or rapidly evolving into MODERN humans (not just anatomically correct) and replacing other archaic hominin populations. This theory, however, is not supported by the fossil record and has encountered numerous problems with advances in genomic sequencing.