In the link below, you will find a list of national capitals. The list includes not only sovereign countries, but several territories, overseas departments, autonomous countries, etc. A sovereign country's name will be bolded, so that is how you can differentiate.

New Territories's population density is 3,748 people per square kilometer.

density dependent

The student's report included density-dependent factors that showed how the size of the population varied with the density of that population.

Density dependent, since the contagiousness of the epidemic depends on the density of the population.