Final answer:
Density-dependent factors in populations are influenced by the density of the population and include A)competition for resources, B)predation, and C)disease.
Step-by-step explanation:
Most density-dependent factors in populations are biological in nature, such as A) competition for resources, B)predation, and C)disease.
These factors are influenced by the density of the population. For example, during competition for resources, the reproductive rates of the species will usually be lower, reducing their population's rate of growth. Additionally, diseases spread more rapidly among denser populations, increasing the mortality rate.