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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. a surplus of food B. the building of villages and cities C. the worship of many nature gods D. the need to unite for protection from enemies E. the presence of rivers PLZ HELP ME!!!!

OpenStudy (ryamorgan284):

its a and c

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