This part of the assignment we will be exploring population demographics the studies of population, where people live, trends in population, and more. population pyramids are charts that compare two different time periods population. their is something called a demographic transition model it shows stages of countries their are 5 stages and each stage tells the demographic transition, stage 1 is high stationary meaning high birth rate, high death rate, and natural increase rate is stable and low, the reason for high birth rate is because of the amount of children made for the purpose of farming and helping their families, high death rate is due to diseases, famine, and poor medical knowledge, many children's die at a early age. Stage 2 is early expanding meaning high birth rate, but death rate falls rapidly because of that natural increase rate rapidly increases, reasons for high birth rate are the same reasons as before but the reasons for death rate are because of improvement in medical care, water supply and sanitation, due to that fewer children die. stage 3 is late expanding meaning birth rate falls, death rate falls more slowly and natural increase rate slows down due to the birth rate, reasons for birth rate falling is because of improved medical care and diet, fewer children needed, reasons for death rate falling slowly are the same reasons as stage 2. stage 4 is low stationary meaning birth rate low, death rate low, and natural increase rate stable because of low birth rate, reasons for birth rate being low is because of family planning, good health, and later marriages, reasons for death rate being low is good health care and reliable food supply. Stage 5 is declining meaning birth rate very low, death rate low, and natural increase rate slow decrease due to birth rate, reasons for birth rate being so low is the same reasons as stage 4, reasons for death rate being low are also same reasons as stage 4. Canada on the demographic chart would be stage 4 meaning low birth and death rate meaning stable natural increase rate, this is because canada has a older population meaning less births. Population density is the measure of population size per unit area so canada's a really high population density near Toronto and Ottawa because of the amount of people distributed their also population distribution is the arrangement or spread of people living in a given area.the key terms of the population pyramids are baby boom meaning the baby rate averaged 3.7 birth per female, this happened in the post world war 2 period in 1945-1965 due to Canadians being confident in having larger families. also another term is dependancy load this is the number of individuals who are under 16 or over 65 and are not permitted or dependent to work, and finally echo boom is the rapid increase in Canada's population due to baby boom it started in 1971-1991, before the baby boom the birth rate was just 1.7 births per female.population is increasing in 1820 we only had 1 billion, in 1970 we reached 3 billion, and finally in 2000 we reached 6 billion, the growth changed into 1 billion per 15 years meaning 2015 has 7 billion people.