Final answer:
The birth rate is the number of births within a population over time, calculated as births per 1000 people annually.
Explanation:
Birth rate refers to the number of births within a population or subgroup per unit time. In human demography, it is commonly measured as the number of childbirths per 1000 people per year.
Crude birth rate is calculated by dividing the number of live births in a year by the population size, multiplied by 1000. This rate provides insight into population growth and fertility levels.
The rate of natural increase is determined by subtracting the death rate from the birth rate, indicating whether a population is growing or shrinking.
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