describe the methods devised by the mesopotamians to control the flooding of the tigris and euphrates rivers and impove agriculture

To solve their problems, Mesopotamians used irrigation, a way of supplying water to an area of land.These ditches brought water to the fields. To protect their fields from flooding, farmers built up the banks of the Tigris and Euphrates. These built-up banks held back flood waters even when river levels were high.

the correct answer is: (1) affected by gerrymandering; (2) not affected by gerrymandering.

gerrymandering is known as a practice that intends to establish a some kind of political advantage for a particular party or group. to do this district boundaries are manipulated. the new resulting district is named a gerrymandering.

in other words, what gerrymandering does is to draw the boundaries of electoral districts trying to benefit the party who is doing it. sometimes, the party controlling the legislature will redraw it so they can maximize the number of districts they are likely to control.