The document discusses three key uses of wetlands: 1) They help prevent flooding by absorbing excess water, as many wetlands are seasonal and dry out for parts of the year; 2) Wetlands are home to many diverse plant and animal species, providing habitat for nearly 50% of amphibians and 43% of endangered bird species; 3) Wetlands help with water collection, as the document describes a sampling device that can repeatedly collect interstitial water from wetland sediments over time without having to remove it from the wetland.