Abroad-based pyramid-shaped age structure is characteristic of a population that is

Your answer would be growing rapidly. ( An age structure pyramid with a broad based means that many young individuals are productive. Once they become reproductive, many individuals will result in the production of many offspring and an increase in the size of the population.)

primary succession begins with a bare rock and ends with a forest secondary succession begins after a natural disaster where there is a temporary setback after a forest fire or local destruction, but the surrounding area can fill in