Concept:Natural growth rate measures population change from births and deaths only.
Explanation:The natural growth rate of population is calculated by subtracting the death rate from the birth rate.
It does not include migration.
It shows the actual increase or decrease in population due to natural causes.
For example, if birth rate is
30 per
1000 and death rate is
20 per
1000, the natural growth rate is
30−20=10 per
1000.
Thus, the natural growth rate is the difference between birth rate and death rate.
Answer:A. difference between birth rate and death rate