Final answer:
Wetlands improve water quality by storing excess water, preventing erosion, removing nutrients, and providing habitat for plants and animals.
Step-by-step explanation:
Wetlands improve water quality by performing several important functions. They store excess water from floods, slow down runoff to prevent erosion, and remove excess nutrients from runoff before it enters rivers or lakes. Wetlands also provide a unique habitat for certain plant communities and a safe habitat for many animal species, resulting in high biodiversity.