HEWhat does it mean to measure a migration rate? How do migration rates affect populations? Explain your answer in at least two or three sentences.

The migration rate is the difference between the number of immigrants and the number of emigrants throughout the year. So you measure it by subtraction. Migration affects the population because it increases the population of the place people migrate/move to, and it also decreases the population of the area where people migrate from.

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they use tree rings to figure out weather patters.