Final answer:
Density-dependent and density-independent factors can interact, as seen in disease outbreaks affected by population density.
Step-by-step explanation:
In population ecology, density-dependent factors and density-independent factors influence population numbers. Density-dependent factors have different effects at different population densities, while density-independent factors have the same effect regardless of population density. An example of their interaction is disease outbreaks affected by population density. When a population density is high, diseases can spread more rapidly among individuals, leading to increased mortality rates.