What was used for transferring water to dry places in Mesopotamia? Aka:

provided the key to successful farming in Mesopotamia where little rain fell.

(I truly can't seem to find the answer, I feel like i'm skipping over something...)

id say bottom left to top top left to bottom right and middle to middle

explanation:

i confess that there are several parts of this constitution which i do not at present approve, but i am not sure i shall never approve them: for having lived long, i have experienced many instances of being obliged by better information or fuller consideration, to change opinions even on important subjects, which i once thought right, but found to be otherwise. it is therefore that the older i grow, the more apt i am to doubt my own judgment, and to pay more respect to the judgment of others.