Which of these characteristics would most likely be used to define a climate region?
a) variety of native plant species
b) height of the tallest mountains
c) proximity to saltwater seas
d) average summer temperatures

The answer is D) Average summer temperatures.

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 is b  employees