Which was part of Sumerian farming and trading? Surplus barley and wheat could be traded for other things.

Lumber, stone, and gold produced in Sumer could be traded for food.

Levees held back the annual floods of the Tigris and Euphrates Rivers

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explanation:

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the option which was not a function of missionaries in the northwest was the first one - they established posts for trading furs and other goods.

missionaries were sent around the world to spread religion and their knowledge and others - they were not merchants who sold furs and other goods.

a phrase from a poem by ralph waldo emerson about the battle of lexington and concord. emerson's words read, “here once the embattled farmers stood / and fired the shot heard round the world.”