What is the primary function of a tributary?

The primary function of a tributary is to flow into and contribute to a larger river. Tributaries are smaller streams or rivers that feed into a main river, adding water and nutrients to the larger system. This process enhances the overall flow and volume of the main river, playing a vital role in the hydrological cycle. By delivering additional water, tributaries can influence the ecosystem, support diverse habitats, and affect sediment transport within the river network.

Choosing this answer shows an understanding of the interconnectedness of river systems, where tributaries serve as important contributors to the health and sustainability of larger water bodies.