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If both birth rate and death rate decline, what is most necessary to understand natural increase?

Answer and explanation

Correct answer: The gap between the two rates

The direct answer is A. Natural increase is determined by the relationship between the birth rate and the death rate. In simple terms, natural increase = birth rate − death rate. Both rates may decline, but the population can still have a positive natural increase if the birth rate remains higher than the death rate. If the two rates become equal, natural increase is zero. If the death rate becomes higher than the birth rate, natural change is negative. Therefore, knowing only that both rates are falling is not enough; we must compare their difference, or gap. Option A is correct. Option B gives only one rate and cannot show the balance. Option C is irrelevant because spelling does not affect calculation. Option D concerns area, not natural demographic change. Memory cue: never judge natural increase from one rate alone; compare births with deaths.

Related tags

Birth RateDeath RateNatural IncreaseProcesses Of Population ChangePopulationGeographyClass 9 Mcq

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