Which of the above statements correctly correlates with the diagrams?

a and b are steady population

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a and d are declining population

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c and d are growing population

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b and d are declining population

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Solution

The correct option is B a and d are declining population
The diagram a and d are of the declining population. The pyramids a and d shows the post-reproductive, reproductive and pre-reproductive stages. The number of individuals in the pre-reproductive stage is lesser than that of the reproductive stage. It is also called as depopulation. It can be caused by infertility, heavy emigration, disease and war. Thus, the correct answer is option B.

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