Which scenario represents the concept of 'natural increase' in a population?

The concept of 'natural increase' in a population refers specifically to the growth rate that results from the difference between the number of births and the number of deaths within a given time period. When this difference is positive, meaning that there are more births than deaths, the population experiences growth, which is termed natural increase.

This scenario indicates a healthy reproduction level within the population, suggesting factors such as effective healthcare, access to resources, and favorable living conditions that support families in having children. In contrast, the other scenarios depict either a decrease in population (more deaths than births) or a stable situation where births equal deaths, which do not signify a natural increase. High immigration, while it may contribute to population growth, falls under the category of net migration rather than natural increase, focusing instead on movement rather than natural reproductive rates. Hence, the correct representation of 'natural increase' is the condition where births outnumber deaths.