Discussion
Hidden momentum of population growth means :
Answer: A
Hidden momentum means that population keeps increasing even after the birth rate falls, because of a large youthful population.
A population that has grown fast has a large share of children and young adults. Even when fertility falls to replacement level, these large cohorts move into the reproductive ages and produce many births in total, so the population continues to grow for several decades before stabilising. This is population momentum.
High birth rates with low death rates describe natural increase, not momentum; growth at the destination of displaced people is migration; and growth despite population control describes failed policy.
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