Final answer:
Density-independent factors have the same effect at all population densities, while density-dependent factors have different effects.
Step-by-step explanation:
Density-independent factors have the same effect at all population densities, while density-dependent factors have different effects. An example of a density-independent factor is an earthquake, which causes changes in population numbers regardless of density. On the other hand, disease is a density-dependent factor, as its impact on population numbers is influenced by density. Emigration and parasitism can also be considered density-dependent factors.