Why was irrigation important to Sumer? A.)It led to the invention of the sail.
B.)It helped create food surpluses.
C.)It led to trade with other city-states.
D.)It moved water from mountains to city-states.

It helped create food surpluses

Explanation: irrigation is about crops, it's to help grow crops where they wouldn't be able to otherwise. So it would help create food surpluses if they were growing more crops.

answer; cattle ranching on the savanna,and forestry in the amazon;

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