Which of the following is not a nonelected position? governor, senior military officials, supreme court justices

Senior military officials, maybe.
Governors are voted in at midterms, and SC justices are confirmed by the Senate (Look up Neil Gorsuch for evidence of that).

The answer is c) protestant clergy

To solve their problems, mesopotamians used irrigation, a way of supplying water to an area of land. to irrigate their land, they dug out large storafe basins to hold water supplies these ditches brought water to the feilds. to protect their feilds from flooding, farmers built up the banks of the tigris and euphrates.hope ths !