Question

Which of the following would necessarily decrease the density of a population in a given habitat?

Options

• Natality > mortality

• Immigration > emigration

• Mortality and emigration

• Natality and immigration

Answer 1

Mortality and emigration

Explanation:

A decrease in population density occurs when individuals die (mortality) or leave the habitat (emigration). Both factors reduce the number of individuals in that population. Therefore, mortality and emigration necessarily decrease population density in a given habitat.