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Which THREE factors led to the development of the four river valley civilization of Mesothelioma, Egypt, the Indus Valley, and China? CHOOSE 3 ANSWERS THAR ARE CORRECT!!! Please ASAP

Which THREE factors led to the development of the four river valley civilization of-example-1
User Jnesselr
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Surplus of food, uniting against threats, and building of villages
User Dyslexit
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