You run into you psychology teacher at a baseball game after you have completed his course. You cannot remember why you know him. This illustrates the concept of .

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 !

Ithink it's c selection but i don't really know.