Why are freshwater ecosystems such important resources? Mark all that apply

The Importance of Freshwater Ecosystems. Water ecosystems, specifically freshwater ecosystems, are some of the most important resources in the replenishment and purification of water sources used by humans ... One of the main functions of wetlands is to remove metals and sediments that make their way into water.

I think because you can easily get fresh water instead of have to purify the water and a lot of sea creatures such as turtles can live