Population density is the number of individuals in a unit square area. As if population density increases in a population that is density-dependent, will increase immigration, i.e., option D.
What is immigration?
Immigration is a process by which individuals become residents of another country permanently.
The process of immigration is of great importance for social, economic, and culture of states.
As population density increases in a population that is density-dependent immigration will also increase.
Thus, the correct option is D.
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