Which sentence best summarizes the central idea of the text?

The author infers that Mesopotamia had a vast goods exchange system that acted as their economy.

PART A: How does the author’s addition of the impact of technological advancements on jobs in Mesopotamia add to the development of the text?

PART B: Which sentences from the text best support your answer in Part A?

Read the sentences.

What effect does the description of the social hierarchy have on the reader's understanding of the roles and importance of different jobs in Mesopotamia?

What conclusion can be drawn about the importance of the two rivers? Explain using key evidence from the text to support your answer.