Fossil and genetic evidence strongly supports the idea that modern humans? 1) independently arose from three different ancestral Homo species in Africa and Eurasia. 2) all derive from a single African lineage that spread from there into other parts of the world starting about 50,000 years ago. 3) derive from an African lineage but also have genes derived from mixing with several Eurasian descendants of Homo erectus. 4) derive from Neanderthals that independently evolved the features of modern humans in Europe and Africa.
