Why is it useful for historians to base certain studies on the analysis of historical periods?
a. the major historical themes apply only to certain civilizations during certain periods
b. the ideas that characterize a particular period are unaffected by ideas from other periods
c. similar events and trend often take place on different places during the same periods
d. experience has confirmed the analyzing periods is the most effective approach to history

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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