List three tools of demography.

1. Population pyramids: A graphical representation of the age and sex distribution of a population, which can provide insights into population trends, such as aging populations or changes in birth rates.

2. Fertility rates: Measures of the average number of children born to women of childbearing age in a population, which can help demographers understand patterns of reproduction and population growth.

3. Life tables: Statistical tools that show the probability of survival and mortality at different ages in a population, which can be used to analyze life expectancy and mortality rates.

1. Census
2. Vital statistics
3. Migration data