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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
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Solution
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.
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