I am not completely sure but I think it's 'agrarian'.
Islam spread with the expansion on the Ottoman empire. When they conquer were exposed to this religion and many people converted. They also used trading to spread Islam trough southeast Asia, Africa an many more parts of the world. The first conversions were flexible, s it was easy for people to convert into Islam.
That depends what you mean by early, do you mean the civilizations of Egypt or Mesopotamia or Israel.
Answer:
During the war, many school buildings were either damaged or requisitioned for war use, causing a shortage of suitable places to conduct school lessons. Lessons were held in unusual places such as chapels, pubs and church crypts.
btw :
stay safe! :3