population factors

So today we learned about crude birth rate and crude death rate. Crude birth rate is the number of births per 1000 people of a population, Crude death rate is the complete opposite, its the number of deaths per 1000 people of a population. We also learned about RNI or "rate of natural increase". This number is produced by subtracting death rate from the birth rate. This gives us The annual natural growth rate in percentage form-for a country or region. After this we went over net migration. Net migration is the difference between the number of people entering and leaving a country during a year. An excess number of persons entering a country is net immigration, which results in a positive number. An excess number of people leaving the country is net emigration, which results in a negative number. Both Net immigration and Net emigration can both greatly influence and change the rate of natural increase. We talked about how Canada has a high immigration number because of the health care they have, unlike countries like Canada, a example is Mexico is that they have a very -1.68 per 1000 population. So this means the population is decreasing. Canadas numbers are 5.65 per 1000 population. So as you can see Canada Is gaining people while Mexico is losing them, now this doesn't mean that people aren't leaving Canada or entering Mexico because people are but more people are leaving Mexico than people are entering the country and more people are entering Canada than people are leaving Canada. So as you can see these factors can greatly affect the population of countries. Now countries like Monaco probably have  long life spans because many people who live there are very wealthy so they can afford very good insurance and health care along with very healthy foods and products. We also discussed why women usually live longer than men, when we discussed this we said because men usually do more dangerous jobs like being cops, working in factories, firefighter, or working on boats or oil platforms, while women are nurses, secretary, or are teachers along with working mainly in office buildings. But over the last couple years women have tarted to work in more dangerous environments such as joining the military or becoming firefighters or even becoming police officers. As I said before many factors influence the population along with the life spans of women and men and the average  life span for both gender combined. Many poor countries can't get access to clean water, affordable health care or even health care at all, and the ability to get proper medical treatment and even get the proper amount of food there supposed to each day, so many factors can affect a population in so many ways.