Using complete sentences, trace the migration patterns of early humans from Africa to North America. Then, explain the theory
of early human migration and the evidence that supports it.

This great migration brought our species to a position of world dominance that it has never relinquished and signaled the extinction of whatever competitors remained—Neanderthals in Europe and Asia, some scattered pockets of Homo erectus in the Far East and, if scholars ultimately decide they are in fact a separate species, some diminutive people from the Indonesian island of Flores . When the migration was complete, Homo sapiens was the last—and only—man standing.

THEORY:

No historical record exists that tracks the migratory patterns of the earliest humans. Scientists piece together the story of human migration by examining the tools, art and burial sites they left behind and by tracing genetic patterns. They accomplish this by looking at mitochondrial DNA (mtDNA), which is passed from a mother to her offspring without being blended with the genetic code of the father. We can look at the mtDNA of two people who lived thousands of miles and years apart, and if their mtDNA genetic code is the same, we know they were ancestor and descendant [source: PBS NOVA].

Examining mtDNA is useful for another reason -- it accumulates mutations relatively quickly. Scientists can see how many mutations are present and roughly determine how old that genetic line is. By comparing the number of mtDNA mutations found in people from different locations, we can tell where humans arrived first. The more mutations, the longer humans have lived in that area. All of the mtDNA found in certain parts of Africa has more mutations than any other mtDNA in the world. This evidence strongly supports the Out of Africa theory. However, even with these clues, much about early human migration is uncertain.

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