Answer:
Option: B. They mark the beginning and ending of different periods.
Explanation:
Periodization tries to give weight to the way history is classified and organized through chronological periods. World history is enormous and dividing with each period differently to help historian and others to understand the past properly. Periodization is done to understand the period history with its political and other events during that particular period. They also help in telling the start and end of different periods.
Sin(64)=0.899=cosx
cos-1(0.899)=x
x=25.973°
Disease is the answer I believe... If not than it is death by war or massacre
