Which feature typical of ancient urbanization was not present in the Nile River Valley hearth?

Name: Which feature typical of ancient urbanization was not present in the Nile River Valley hearth?
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Defensive walls were not present in the Nile River Valley hearth during ancient urbanization, as the natural barrier of the river provided protection for the cities. However, the other features listed (system of writing, urban elite, and religious structures) were all present in ancient Egyptian civilization.

Which Feature Typical of Ancient Urbanization Was Not Present in the Nile