What did city-states in Sumer have in common?

a)They shared the same laws.
b)They were centers of trade.
c)They were all ruled by one king.
d)They were home to millions of people.

Answer :

chitindakun

B. they were centers of trade.

im not sure but tis is the correct answer

they fought for control of the river water

Answer:

A

Explanation:

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