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A geographical feature, shared by the world's four ancient civilizations (Mesopotamia,
Egypt, Indus Valley and China) made it possible for them to grow enough
crops to feed
a civilization of thousands of people. This was
A. Islands
B. River valleys
C. Mountains
D. Oceans
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A geographical feature, shared by the world's four ancient civilizations (Mesopotamia,
Egypt, Indus...
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