Christopher Heath Wellman argues that nations have a right to close their borders, a right derived from the more fundamental right to . a. make laws b. self-defense c. freedom of association d. freedom of religion

They went to leyden, holland

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 !