Migration rates birth rates and death rates are always to measure changes in

Population

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.

Since death, birth, and movement are the key parameters that determine changes in population they, in turn are used to measure changes in population.

answer; i believe the correct answer is ; large pieces of pangaea drifted in different directions over millions of years;