The world population has grown very rapidly because the death rate has gone down as a result of the growth of food supplies and the improvement of medical facilities.
• Also, unlike the death rate, the birth rate has remained quite high.
• The birth rate and the death rate are two factors that influence population change.
• The birth rate is the number of live births per 1000 people while the death rate is the number of deaths per 1000 people.
• Thus, the birth and death rates affect the balance of population.