The words needed to complete the sentence structure are quantitative and qualitative. They are the types of research that further investigates the study. In a qualitative research, it is the deeper investigation of the paper which uses some methods like focus groups. Meanwhile, a quantitative research gathers data through surveys and audits.
Revolutions are organised social unrest that lead to a violent upheaval of the political system. They start usually due to economic factors - famine or poverty, weak leadership, and consolidation of opposition power into a popular movement.
