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B
No emigration
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C
No new births
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D
Number of births and deaths equal
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Solution
The correct option is B Number of births and deaths equal Zero Population growth is a condition where the population remains stable. The population neither grows or declines because number of births and deaths are equal.
Birth rate defines as the number of births per 1,000 people per year, while death ratedefines as the number of deaths per 1,000 people per year. So, for example, in a population there are 10 births and 10 deaths, then there would be zero population growth. Hence option D is correct.