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In the past decade there has been a heated debate going on about how humans evolved Is everyone related to one ancestral Eve Or did Homo sapiens radiate out of Africa and develop in different quadrants of the world The latter has much more substantial evidence consisting of actual bones and fossils where as the idea of Eve is based purely on biological evidence that may have many sources of error There are two principal explanations about the spread of man The multi-regional theory holds that Homo sapiens developed among Homo erectus groups in several parts of the world at more or less the same time perhaps as advanced newcomers drifted in and added their genes to the local gene pool The concept that would help explain differences in appearance between say Asians and Africans The other theory known as the Out of Africa Eve hypothesis holds that Homo sapiens evolved in one area of Africa about a quarter of a million years ago and gradually spread throughout the world eventually replacing Homo erectus everywhere without considerable interbreeding Presumably the more artful and language-prone Homo sapiens simply out-competed the earlier model leading to Homo erectuss extinction Both explanations have their faults but when it comes down it the multi-regional theory has more support and sense than the Eve hypothesis The latter theory is based on mitochondrial DNA evidence that seems fine at first glance but how could overtaking Homo sapiens take over and practically transform themselves into the earlier residents of the area in only 150000 years It seems virtually impossible for a race to be able to change races in such a small amount of time even if they are exposed to the same environmental factors Besides changing races the new inhabitants seem to have changed their cultures too In particular if Homo sapiens had brought their culture to Asia then why havent Achulien hand axes
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