Assertion: oyster | /r/CapableOf | help keep the water
Facets:
Source sentences:
text: In doing so, oysters help keep the water clean and clear for underwater grasses and other aquatic life.
text: They help purify the water, control erosion, and provide habitat for numerous other species.
text: That’s because oysters help clean up the water they live in.
text: Because oysters are filter feeders, they help keep the water clean.