Q.Draw a distinction between a "stable" and a "declining" age pyramid in terms of the proportion of individuals in the pre-reproductive age group.

A stable age pyramid shows roughly similar proportions of individuals in the pre-reproductive and reproductive age classes, giving the pyramid a more bell-shaped or rectangular overall profile; such a population tends to maintain approximately the same size over time, since roughly enough young individuals are present to replace those lost from the reproductive and post-reproductive classes. A declining age pyramid, by contrast, has a narrow base of pre-reproductive individuals relative to the reproductive and post-reproductive classes above it, producing an urn-like shape that is wider higher up than at the bottom; with comparatively few young individuals available to replace ageing or dying m …

Focus specifically on the WIDTH OF THE BASE (the pre-reproductive class) when comparing the two — that single feature is w …

Do not describe the declining pyramid as simply "small" — the shape/proportions matter, not the population's current absolute size; even a cu …