Egypt and Nubia relied on the Nile River because it: A. was a major source of gold and silver.
B. brought water to crops when it flooded.
C. was shallow enough to cross without boats.
D. connected them to Mesopotamia.

A AND B

Explanation:

Nubia received very little rainfall and depended on the Nile River's annual floods in order to farm. The Nubians farmed a narrow strip of farmland along the Nile and generated a surplus of food, but not as much as Egypt. This caused them to generously grade gold, iron, and other products for Egypt's grain

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