sentences:  Anthropologists have been divided as to whether current human population evolved as one interconnected population (as postulated by the Multiregional Evolution hypothesis), or evolved only in East Africa, speciated, and then migrating out of Africa and replaced human populations in Eurasia (called the "Out of Africa" Model or the "Complete Replacement" Model).Neanderthals and modern humans coexisted in Europe for several thousand years, but the duration of this period is uncertain.Modern humans may have first migrated to Europe 40–43,000 years ago.