How were the economies of ancient Mesopotamia , Egypt and the Indus Valley similar?

They were all based on the development of agriculture and later trades and crafts.

Explanation:

The oldest civilizations, including this ones were created in the river valleys, where the first permanent settlements were created.

With the development of irrigational systems, the agriculture was introduced as a main source of profit. Of course, later different labors, including certain crafts were introduced, and then a trade between these regions.

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an outline of all three paragraphsan identification of the historical era that you are writing aboutan explanation of the term mass productiona description of two ways new technology affected industrya conclusion that shows how new technologies allowed industrialization to grow