Walls of land built to hold back on water are known as

levee  or dam

Explanation:

a wall that hold back water is a , levee or dam

affirmative action refers to the policies that take gender, race, or ethnicity into account in order to promote equal opportunity.

employers subject to title vii are prohibited from taking race or sex into account in any employment decisions. aa is a penalty for having any job group substantially statistically "underutilized" in any race or either sex. the employer must take steps to eliminate the underutilization, then stop, ending its aa efforts

b) brahmans   is nomadic society