To create a stable population, the inflow and outflow of population must balance each other out. In terms of the population change equation:
Population change = (Natality – Mortality) + (Immigration – Emigration) = 0
This can be rearranged to find a condition for stability:
Natality - Mortality + Immigration - Emigration = 0
This implies that:
Natality - Mortality = Emigration - Immigration
From the provided options, the equation that expresses this relationship correctly is:
natality - mortality = immigration - emigration
So, the correct response is:
natality - mortality = immigration - emigration