How did a surplus of food lead to the first civilizations?

The use of irrigation enabled early people to farm more land and to farm in drier conditions. As a result, farmers could plant more crops and produce more food. With irrigation, some farmers began to produce a surplus, or excess, of food. With surplus food, villages could support larger populations

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c) the invasion of the shang

the apache were not receiving guns from the spanish.(a) is the correct

explanation: