The size of a population is affected by the supply of available resources.
This is because when the population is in a region with many available resources, they tend not to suffer to find adequate food, water and habitat. For this reason, matings are more frequent, and the mortality rate among members is lower than the birth rate, which contributes to the increase in the population. However, if resources are limited, the population does not have everything they need for their survival, allowing the mortality rate to be higher than the birth rate, which contributes to the decrease in population.
