Which was part of sumerian farming and trading

Sumerian agriculture and commerce had levees to prevent the annual flooding of the Tigris and Euphrates rivers, and surpluses of barley and wheat that could be exchanged for other commodities.

Explanation:

The Sumerians were the first people to develop cities and build a civilization around 3000 BC around the growing fertile Tigris and Euphrates rivers. These people were noted for having improved the irrigation techniques of the rivers that fed their plantations and the urban areas with population concentration. The Sumerian economy, therefore, was eminently associated with water management and ariculture. Sumerian agriculture and commerce had levees to prevent the annual flooding of the Tigris and Euphrates rivers, and surpluses of barley and wheat that could be exchanged for other commodities.

is there options? or is it random words?

explanation:

united states reinforcements contributed greatly to three allied victories in france at: cantigny (first major american battle), argonne (the largest in the united states military history, involving 1.2 million american soldiers), and château-thierry (one of the first actions under general pershing).