What area was not among those where the first civilisations developed?

Civilizations are characterized by

 Today, research on the development of civilization focuses on:

The Mesopotamian lowlands may have supported farmers before:

A rapid evolution to urban life was marked by:

By __________ Sumerian civilization was in full swing

Ancient Egyptian civilization resulted from: 

Ancient Egyptian civilization declined after: 

Egypt fell under Roman rule in:

Egyptologists conventionally subdivide Ancient Egyptian civilization into____ main periods: