What is the primary function of soil in an ecosystem?

The primary function of soil in an ecosystem is to support plant growth and filter water. Soil provides essential nutrients, water, and a suitable medium for plants to anchor their roots, allowing them to grow. This process is critical for the sustenance of plant life, which forms the base of terrestrial food webs.

Additionally, soil plays a vital role in filtering water. As water percolates through the soil layers, it undergoes natural purification, which helps in removing contaminants and regulating the water cycle. The interaction between soil and water is essential for maintaining the health of both the soil and the surrounding ecosystems.

While soil can contribute to pollutants under certain conditions, its primary role is not to act as a reservoir for pollution. Similarly, while soil does store minerals, its function extends far beyond that to encompass nutrient cycling and supporting diverse life forms. Lastly, soil does not prevent organisms from thriving; in fact, it is a habitat for countless microorganisms and organisms essential for nutrient cycling and overall ecosystem health. Therefore, the answer emphasizing the supportive and filtering roles of soil accurately captures its significance in the ecosystem.