Population growth is limited by density-dependent factors such as

predation and disease
volcanoes and earthquakes
droughts and floods
biotic and abiotic factors

The correct answer is predation and disease.

Density dependent factors are those factors, which are directly influenced by the  density of a population. These factors directly influence the size and the growth of the population.

The predation and the disease are density dependent factors, as predation of a small density population would cause a significant decrease in number, so, predation is the limiting factor for the growth of the population. Same for diseases, the disease can affect most of the members of the population, and limiting its growth.

The changes in the environment and the natural calamities  are density independent factor.

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