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The correct answer is option 4, Emigration. Emigration refers to the number of individuals who leave their current habitat or population and move to another location during a specific time period. It is the opposite of immigration, which refers to the number of individuals who enter a habitat or population.
Option 1, Natality, refers to the birth rate or the number of new individuals being born into a population. This option is not related to individuals leaving the habitat.
Option 2, Mortality, refers to the death rate or the number of individuals dying within a population. This option is also not related to individuals leaving the habitat.
Option 3, Immigration, refers to the number of individuals entering a habitat or population. While it is related to individuals moving, it is not specifically about individuals leaving the habitat.
Therefore, the correct answer is option 4, Emigration.