Answer:
They filter sediments and other material from runoff
Step-by-step explanation:
Wetlands are places that are mostly ‘wet’ most of the time of the season and are filled with aquatic plants and riparian vegetation. Most of the time this water is still and anoxic. Wetlands are important because they allow the sediments in the still waters to settle, and also the ecosystem takes out the nutrients/dissolved molecules hence purifying the water before it is released into the water bodies such as oceans and lakes.