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OpenStudy (anonymous):

What contributed the most to human migration more than ten thousand years ago? Sturdy boats were invented. Another Ice Age occurred. A major volcano erupted in Africa. A severe drought occurred.

OpenStudy (anonymous):

I'm going to guess that boats were finally perfected enough to permit decent passage through waterways?

OpenStudy (anonymous):

yes! it makes so much more sense when someone explains it to me. @Khirro

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