As fossil evidence has shown, we see that all prehuman forms, from the Proconsul to the Australopithecines, resided in parts of Africa. We do not see any movement out of Africa until the appearance of Homo erectus fossils. These fossils have been discovered not only in Africa, but also in parts of Europe and Asia. This is when scientists begin to disagree about how these premodern humans spread from Africa to other continents. Some scientists believe in the hypothesis known as multiregional theory. This theory states that Homo erectus left Africa around two million years ago and then migrated to Europe and Asia. These H. erectus then simultaneously evolved into Homo sapiens, or the modern-looking, culturally evolved humans we are today. Another hypothesis that has been presented is the uniregional theory. This theory states that although Homo erectus migrated from Africa to these regions, Homo erectus evolved into Homo sapiens in Africa, and only in Africa. These H. sapiens then traveled to other continents and replaced the H. erectus and Neanderthals who lived there. More and more fossil evidence has been found to support the uniregional theory at present and is the most likely option for human migration. Scientists attempt to prove these theories using fossils found in different locations, studying what DNA can be found in the fossils, and they also examine other evolutionary theories to find possible answers and clues about how continents were populated. "or 'convergent' evolution of modern humans in different isolated populations" (Hawks and Wolpoff 89) and is based on the idea that earlier hominids, such as Australopithecines, e...... middle of article. .... .d Milford Wolpoff. “Sixty Years of Modern Human Origins” American Anthropologist 105.1 (2008): 89-100. Internet. March 25, 2011.6. Johansson, Donald. “Origins of modern man: multiregional or outside Africa.” ActionBioscience.org. (2001): Printing.7. Lestrel, P, F. Ohtsuki, and CA Wolfe. “Cranial vault shape in fossil hominids: Fourier descriptors in norma lateralis..” Journal of Comparative Human Biology 61.5 (2010): 287-313. Internet. March 25, 2011.8. Lieberman, Leonard and Linda Jackson. “Race and three patterns of human origin.” American Anthropologist 97.2 (1995): 231-42. Internet. March 25, 2011.9. Shang, H, H Tong, S Zhang, F Chen, and E Trinkaus. "A modern human from Tianyuan Cave, Zhoukoudian, China..." Proc Natl Acad Sci USA. 104.16 (2007): 6573-8. Print.10. Stone, L. and Lurquin, P.F. (2007). Genes, culture and human evolution: a synthesis.Blackwell Publishing.