Answer:
Population
Step-by-step explanation:
Migration rates, birth rates, and death rates are always used to measure changes in the population of a region or place.
These parameters are tools for construing population dynamics.
- Migration rates are the number of immigrants coming into a place and the number of emigrants moving out of a place.
- Birth rates are the total number of birth per thousand of population per year.
- Death rates are the total number is the number of deaths in a locality.
- It is also called mortality rate.
Since death, birth, and movement are the key parameters that determine changes in population they, in turn are used to measure changes in population.