The main components of population are births,deaths and migration.Natural resources is defined as the different between live births and death.Net migration is defined as difference between the number of people moving into an area and number of people moving out.Because it is difficult to measure actual migration, demographers often estimate migration as a residual value, by calculating the difference between total population change and natural increase

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According to me there are three components of population------> (1) Death Rate...... (2) Birth Rate...... (3) Migration....
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