Final answer:
Wetlands act as a natural defense against overflowing and pollution by storing excess water, filtering water, and providing a unique habitat. They play a crucial role in maintaining the health and balance of ecosystems.
Step-by-step explanation:
Wetlands act as a natural defense against overflowing and pollution. They store excess water from floods, slow down runoff to prevent erosion, remove excess nutrients from runoff, and provide a unique habitat for plants and animals. By filtering water and protecting coastal lands, wetlands play a crucial role in maintaining the health and balance of ecosystems.