Final answer:
The four factors that influence the intrinsic rate of increase are birth rates, death rates, immigration, and emigration.
Step-by-step explanation:
The four factors that influence the intrinsic rate of increase in a population are birth rates, death rates, immigration, and emigration. Birth rates refer to the number of births that occur within a population, while death rates refer to the number of deaths. Immigration is the movement of individuals into a population, while emigration is the movement of individuals out of a population. These factors can impact the population growth rate and determine whether it increases, decreases, or remains stable.