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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.

Respuesta :

Answer:

Option: B. They were centers of trade.

Explanation:

The kingdoms of Sumer organized into city-states. There were many villages and towns, with hundred and some with populations of 40,000. Cities became the centres of trade which offered people more opportunities. Some of the city-states were included  Ur, Uruk, Nippur, Eridu, Kish, and Lagash.