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OpenStudy (anonymous):

WILL GIVE MEDAL!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! 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 presence of rivers C. a surplus of food D. the worship of many nature gods E. the building of villages and cities

OpenStudy (secret-ninja):

I would go with Option B D and E.

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