The mean age at the beginning of the growth spurt in girls is:

It rarely starts at 10 but it's around the 10 throughly 13 range.

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 !