The question asks for the term describing a population state where the number of individuals entering the population equals the number of individuals leaving it, resulting in no net change.
Defining Population Dynamics
Population change is influenced by four key factors:
- Births (Natality): Individuals added through reproduction.
- Deaths (Mortality): Individuals removed through death.
- Immigration: Individuals entering the population from elsewhere.
- Emigration: Individuals leaving the population to go elsewhere.
Understanding Zero Population Growth
The specific state described in the question occurs when the total number of additions (births + immigration) is exactly equal to the total number of subtractions (deaths + emigration).
Mathematically, this can be represented as:
Births + Immigration = Deaths + Emigration
When this condition is met, the population size remains constant over time. This state is known as Zero population growth.
Analyzing the Options
- Population growth rate: Measures the net change in population size over time, which can be positive, negative, or zero.
- Morbidity rate: Refers to the prevalence of disease in a population, not population size change.
- Total fertility rate: The average number of children born to a woman over her lifetime.
- Zero population growth: The state where the population size is stable because additions equal subtractions, matching the question's description.
Therefore, the correct term is Zero population growth.
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