Population stabilisation occurs when the overall size of a population remains relatively constant over time. This happens when births and immigrants together balance deaths and emigrants. The stem describes exactly this balance,so stabilisation is the appropriate term.
Option A:
Population explosion denotes a rapid and often uncontrolled increase in population. It implies that births greatly exceed deaths and migration balance. Therefore it does not fit the equilibrium condition stated in the question.
Option B:
Population stabilisation emphasises a dynamic balance rather than zero births or deaths. Even with ongoing demographic processes,the total population can remain steady when inflows and outflows offset each other. This logic matches the stemโs description.
Option C:
Population decline would involve deaths and emigration exceeding births and immigration,leading to shrinking population size. The question does not describe this scenario,so decline is not correct.
Option D:
Population transition refers to the broader process of shifts in birth and death rates over time,as captured in the demographic transition model. While stabilisation may be an outcome,transition does not specifically denote a balanced situation.
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