Bell-shaped age pyramid indicates that

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(D) The correct answer is $D$. All of the above.$A$ bell-shaped age pyramid indicates a moderate proportion of young to old individuals.As the rate of

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(D) The correct answer is $D$. All of the above.$A$ bell-shaped age pyramid indicates a moderate proportion of young to old individuals.As the rate of growth becomes slow and stable,the pre-reproductive and reproductive age groups become more or less equal in size,while the post-reproductive group remains the smallest.In a stable population,the intrinsic rate of natural increase $(r)$ is zero.$A$ bell-shaped curve is only possible when $r = 0$,which means the population growth is zero.An age pyramid is a graphic representation of different age groups found in a population,with the pre-reproductive group at the base,reproductive individuals in the middle,and the post-reproductive group at the top.There are three main types of age pyramids:$(i)$ Triangular Age Pyramid: The number of pre-reproductive individuals is very large. The number of reproductive individuals is moderate,and post-reproductive individuals are fewer. The population size is growing.$(ii)$ Bell-shaped Age Pyramid: The number of pre-reproductive and reproductive individuals is almost equal. Post-reproductive individuals are comparatively fewer. The population size is stable.$(iii)$ Urn-shaped Age Pyramid: The proportion of the reproductive age group is higher than the individuals in the pre-reproductive age group. The number of post-reproductive individuals is also sizable. This represents a declining population with negative growth.

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