TRAVIS LOLLER Associated Press KYLES FORD, Tenn. (AP) — On a recent late fall afternoon at Kyles Ford, the white branches of sycamore trees overhung the banks of the Clinch River, leaves slowly turning yellow. Green walnuts covered the ground. The shallow water ran fast and cold over the rocky bottom, but it was littered with the white shells of dead mussels. Freshwater mussels range from about the size of a large button to the size of a billfold, but the work they do for ecosystems is enormous. They can filter around 8-10 gallons of river water each day, cleaning it of algae, silt and even heavy metals and making the whole river a better environment for fish, amphibians, plants and bugs. Mussels also benefit the people who use their rivers as a source of drinking water. That's why
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