In the 600's, Islam spread far North and East Africa through trade and the spread of the Arabic language. The expansion of the Arab Empire in the years following the Prophet Muhammad's death led to the creation of caliphates, occupying a vast geographical area and conversion to Islam was boosted by missionary activities particularly those of Imams, who easily intermingled with local populace to propagate the religious teachings.
The answer would be obeying the law. It is required in democracy, while volunteering, reading the news, and voting are not required.
8 battleships were at pearl harbor. All 8 were damaged, 4 of which sank.