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Birth rate is the number of live births per thousand persons in:
Topic: Birth rate
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Answer
(a) 1 year.
Birth rate (NATALITY) is expressed per thousand persons PER YEAR.
Using a fixed period and a fixed population size is what makes the figure comparable — between countries of different sizes, and between one year and the next.
MORTALITY (death rate) is defined the same way: deaths per thousand persons per year. The POPULATION GROWTH RATE is the difference between the two, adjusted for migration.
Keep these apart from POPULATION DENSITY, which is people per square KILOMETRE — the only one of the four measured per area rather than per year. The unit tells you which term is meant.
1 year.