2 Answers

Ekra · Answer 1 · 2021-11-30T02:22:20+0000

Sumer had unpredictable floods, causing the need to develop irrigation. It had no natural barriers, causing the need to build walls.

Asgerhallas · Answer 2 · 2021-12-01T13:54:56+0000

Answer:

Sumer had unpredictable floods, causing the need to develop irrigation. It had no natural barriers, causing the need to build walls. It had a lack of natural resources, fostering the need for trade with other peoples.

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