To accurately determine the rate of increase for an individual country, what besides births and deaths should you consider?

We should take into consideration the process of migration, both immigration and emigration.

Explanation:

This is an important factor especially in those countries, where the rate of migration is really high, let's say Germany in Europe, or United States. Today, for example we can mention Syria, as country from which many people are escaping to the political problems. That is why the migration from that country has changed the structure of population.

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