Phases of a Demographic Transition

fully explain why at the beginning of demographic transition the crude birth rates and crude death rates are high. at the end of transition process(stage4) rates are very low but total population of the county is much higher in stage4 than in stage1

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the assignment topic:
at the beginning of the demographic transition the crude birth rates and the crude death rates are generally high 35-40 per 1000 at the end of the transition process (stage4)the rates are very low approximately 10 per 1000 but the total population of the country is much higher in stage 4 than in stage one , fully explain why ?

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