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In the homepage for Human Evolution? — Science & Theology a subsection about unresolved scientific questions explains that "although most scientists... have reached a confident consensus about the major questions, there is disagreement about some details," including the shape of an evolutionary family tree. For example:
• There are two main scientific theories about the biological development and migration patterns of modern humans: Single Origin (Out of Africa, Population Replacement) and Multiregional. Single Origin claims that all ancestors of modern humans originated in Africa; they migrated outward and displaced other hominid populations throughout the world. Multiregional Continuity claims that our ancestors evolved continually in separate groups, but interbreeding between groups produced a unity of the human species across races. Single Origin is dominant among scientists, although Multiregional has some support.
• note: Three other controversial questions ask, "What is the genetic relationship between Neanderthals and Humans?" and "If small hobbit-like creatures were a separate species (Homo floresiensis), where do they fit into the family tree of modern humans?" and "Did the history of human origins include Human Evolution with Common Descent?"
I.O.U. — This page will have more content later.
Here are a few starter-pages:
• An introductory overview (18 k) is Origins of Modern Humans: Multiregional or Out of Africa? by Donald Johanson, who says "the current best explanation for the beginning of modern humans is the Out of Africa Model."
• The Origin of Anatomically Modern Humans by Jim Bindon is a PDF file of PowerPoint. (an information-filled 14 k)
• In his weblog, John Hawks explains the difference between multiregional evolution and multiple origins.
• Multiregionalism vs. Out of Africa by Susan Carr, says "a catastrophic event [eruption of a super-volcano] approximately 71,000 years ago may one day blow both theories out of the water and give rise to new questions."
• A genetic study in Africa published in 2009 suggests that "the region in southwest Africa [near the border of Angola and Namibia, near the Kalahari Desert] seems, on the present evidence, to be the origin of modern humans."
• IOU - We'll also have young-earth views, such as
• http://creationwiki.org/Mitochondrial_Eve#Mitochondrial_Eve