Answer:
1. Birth rate
2. Fertility rate
3. Migration rate
4. Growth rate
Explanation:
1. Number of BIRTHS per 1,000 people per year = BIRTH rate
2. Fertility means the ability to have kids or the action of having kids
3. Immigrant is someone who migrates into a place, emigrant is someone who migrates out, so it has to do with migration
4. Deaths/Emigrants means population lost, immigrants/births means population gained, so it has to do with the growth of the population
