Recent African origin of modern humans
In paleoanthropology, the recent African origin of modern humans, also called the "Out of Africa" theory (OOA), the "recent single-origin hypothesis" (RSOH), "replacement hypothesis", or "recent African origin model" (RAO), is the most widely accepted model of the geographic origin and early migration of anatomically modern humans. The theory argues for the African origins of modern humans, who left Africa in a single wave of migration which populated the world, replacing older human species.