IB ESS Topic 8 || with A+ Guaranteed Solutions.

Demographics correct answers the study of the dynamics of population change Exponential curve- correct answers when populations follow an accelerating rate of growth which is proportional to the population size Crude Birth Rate (CBR) correct answers number of births per thousand individuals in a population per year Crude Death Rate (CDR) correct answers number of deaths per thousand individuals in a population per year calculate CDR and CBR correct answers dividing the amount of deaths or births by the population, and then multiplying it by 1000. Natural Increase Rate (NIR) correct answers rate of human growth expressed as a percentage change per year. calculate NIR correct answers CDR-BDR, then divide it by 10. Doubling Time (DT)- correct answers the time it take for a human population to double Total Fertility Rate (TFR)- correct answers average amount of children each woman has over a lifetime. 3 Estimates on Human Population Growth Over Time correct answers High Variant- assumes that CDR will continue to fall rapidly but that the CBR will continue to fall slowly Medium Variant- middle ground and straight forward projection of the curve Low Variant- assumes we will not find a cure to AIDS or any of the other big killers and that CBR will fall. Factors That Affect Population Size correct answers Birth Rate Death Rate Immigration Emigration Fertility Rates- correct answers number of births per thousand women of childbearing age. Fertility Rate + 2.0) correct answers higher pop fertility rate -(2.0) correct answers lower pop