D. Continued population growth after fertility reaches replacement level due to young age structure
Answer: Option D
Solution (By JKSSB Mock Tests)
Population momentum occurs when a young age structure (many future parents) causes growth to continue for decades even after fertility falls to replacement level, as births exceed deaths temporarily.
Explanation:
NRR refines GRR by incorporating survival probabilities from birth to each reproductive age, indicating whether a generation of women is exactly replacing itself (NRR=1) after accounting for female mortality.
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