The sumerians invented the first lunar calendar. a lunar calendar mainly uses the ___ to keep track of time. A. positions of stars
B. Tigras and Euphrates rivers
C. phases of the moon
D. bible

Iwould say the answer would be b

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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 !