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4. (25 points} For the demographic transition: A. define and graph the three-phase demographic transition. For each of the phases, present the relationship between fertility rates, death rates, and net population change. B. in a few paragraphs, discuss possible implications of the Covid 19 experience on the demographic transition. 1What similarities are there with the Spanish Inuenza of 1917- 1919? . what are the formulas for the crude mortality rate, general fertility rate, and death cause distribution rate. . discuss how Gary Becker's fertility model interacts with Parson Malthus's work. what was Malthus's assumption regarding the relationship between income and household size? . what was Becker's conclusion regarding the relationship between income and household size? G. how does Becker resolve the contradiction between facts we observe and Malthus's View for the relationship between income and the number of children a household has? H. what are the stages of Omran's epidemiological transition? What type of mortalities are common in each stage? was 'Tl