Final answer:
The age pyramid with the largest base of pre-reproductive population would have a pyramidal shape with a broad base.
Step-by-step explanation:
Age pyramids depict the distribution of age groups within a population. Features include a broad base for a young population, a narrow top for an older population, and various shapes indicating population trends. Pyramids help analyze demographics, predict future trends, and guide social and economic policies.
A population pyramid represents the age-sex structure of a population. A large base on a population pyramid represents a high proportion of young individuals, many of whom are of pre-reproductive age. This indicates a population with high birth rates and a larger pre-reproductive population. Therefore, the age pyramid with the largest base of pre-reproductive population would have a pyramidal shape with a broad base.