A population's age structure is usually defined in terms of organisms in the pre-reproductive stage, reproductive stage, and post-reproductive stage.

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Quizplus · Accepted Answer

This is true. Age structure is commonly described using these three stages, with individuals in the pre-reproductive stage being too young to reproduce, individuals in the reproductive stage actively reproducing, and individuals in the post-reproductive stage no longer capable of reproducing.

A Population's Age Structure Is Usually Defined in Terms of Organisms