Demographic transition (how it went)

Today in class we took a quiz on the demographic transition. It had labeling the demographic chart, some multiple choice questions and the stages stage one through five stage one is low growth, stage two is high growth, stage three is moderate growth, and stage four is low growth. Most of human history was spent in stage one but today no country is in stage one most are in stage two. A country moves from stage two to stage three when the CBR begins to drop rapidly, a society enters stage three when people have fewer children. A country reaches stage four when the CBR declines to a point where it reaches CDR and the NIR approaches zero.