The impact of immigration on population density is:

Step-by-step solution

The population density of the population is mainly affected by four factors, i.e. natality, mortality, immigration and emigration. Natality and immigration contribute to an increase in population density, while mortality and emigration contribute to decrease in population density. Thus, the impact of natality and immigration is positive, while, mortality and emigration is negative. The formula for calculating population density is: N t = N o [ ( B + I ) - ( D + E ) ]