Which of the following contributes to increase in population density?

Solution:

Population density is the number of individuals per unit area or volume. Factors that influence population density include:

1. Natality (Births): Increases population density.

2. Mortality (Deaths): Decreases population density.

3. Immigration: The influx of individuals from other populations into the local population. This increases population density.

4. Emigration: The outflow of individuals from a local population to other areas. This decreases population density.

Therefore, immigration directly contributes to an increase in population density. Mortality, emigration, and an increased death rate compared to the birth rate all lead to a decrease in population density.