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a number system based on the number 60 invention of the sail first to use the wheel or all the answers are correct...
Cuneiform.
People in the villages had to work together to take care of the system. (This was an Assessment 4 question for the Rise of Sumerian city-states)
A new farming technique invented by Sumerians was irrigation.
In a number of the Sumerian City-States, the priests wielded direct political power. This would make them theocracies.