By age 51, most women enter menopause. this is an example of how a biological process can exert a influence on development.

Normative age-graded influence. These are influences related chronological age. Retirement from service may be considered as normative age- graded influence. These are determined by biological factors or environment or sometime both. They usually occur with greater frequency.

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 !