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OpenStudy (anonymous):
Which factors led to the development of the four river-valley civilizations of Mesopotamia, Egypt, the Indus Valley, and China? Choose all answers that are correct. A. the need to unite for protection from enemies B. the building of villages and cities C. a surplus of food D. the worship of many nature gods E. the presence of rivers
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OpenStudy (e.mccormick):
Might want to ask in history.
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