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The Out of Africa Hypothesis is a theory that implies that the ancestors of all living people migrated from Africa to other parts of the world, "displacing and eventually replacing all other early human populations" as they spread.

On the other hand, there is another valid theory called the Multiregional Hypothesis, which states that "all modern humans evolved in parallel from earlier populations in Africa, Europe, and Asia", along with some interbreeding between these regions. This theory is supported by the minor anatomical similarities held between the H. erectus that lived in these same areas and modern-day humans.

One way to determine the truth is to research into mitochondrial DNA, which reveal the diversity and mutation rate in living human cells who live outside of Africa. From this, we have gathered that the average time of divergence was around 200,000 years ago. This proves too young for the Multiregional Hypothesis to be legitimate,

Sources:

[[1]] Madsen, Jorn. "Who was Homo erectus? Homo erectus marked an evolutionary leap for hominids. He walked mostly upright and had a larger brain than earlier ancestors. Apart from that, we know little about him, but several surprising discoveries have been made in recent years, inspiring sensational theories and raising new questions about ancient member of our species' family tree." Science Illustrated July-Aug. 2012: 20+. General OneFile. Web. 19 Oct. 2014.

http://www.signsofcreation.com/darwinismwatch04.htm

History Manual (pages 28-29)

-Sara Lichtarge