Which situation would result in a population represented by an inverted triangular population pyramid, which is heaviest at the top?

Question

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A population decline would result in an inverted triangular population pyramid that is heaviest at the top, as there would be fewer young people and a larger proportion of older individuals. This could be due to factors such as a decrease in birth rates or an increase in mortality rates among younger individuals.

Which Situation Would Result in a Population Represented by an Inverted