What's was the most inportant factor in making mesopotamias farmland fertile.

Witch one is it soo it the the question b.a,b,c,d

If we review the changes in the landscape surrounding the great salt lake in utah we can see a change in topography. look at the area to the south of the lake. what change has occurred during the last twenty-nine years? a) erosion of the hills b) an increase in marshland c) flooding of the area and the development of wetlands d) deposition of sediments and an increase in elevation

Is an official language in every north african country