1. Which of the following is NOT a length of time singled out because of a specific event or development that happened during that time?
1.period 2.era 3.millennium 4.epoch

3, it is not a length of time, it is a group

The  pan-african movement  was an "emotional, cultural, psychological and ideological  movement  that began among the  african  dispora in the western hemisphere, for a closer  purpose, so that  african  people could feel secure, attain political, economic as well as psychological power visa vis other races or world regions" .

Your answer is 2 because you do keep change flip when you divide fractions