Both Statements 1 and 2 correctly describe the importance of soil.
Statement 1 highlights the role of soil in filtering pollutants and protecting groundwater, which is essential for maintaining a healthy ecosystem and providing clean drinking water.
Statement 2 points out that soil can be used as a natural building material, which is significant in sustainable construction practices and can reduce the environmental impact of building materials.
Therefore, both statements are important aspects of soil's significance.