The dominant view among scientists concerning the origin of
anatomically modern humans is the
"Out of Africa" or recent African origin hypothesis, which argues that
H. sapiens arose in Africa and migrated out the continent around 50-100,000 years ago, replacing populations of
H. erectus in Asia and
H. neanderthalensis in Europe. Scientists supporting the alternative
multiregional hypothesis argue that
H. sapiens evolved as geographically separate but interbreeding populations stemming from a worldwide migration of
H. erectus out of Africa nearly 2.5 million years ago.
good article of evolution of mankind
http://en.wikipedia.org/wiki/Timelin...uman_evolution