Assertion: earthworm | /r/CapableOf | play major role
Facets:
value: in the food chain
type: LOCATION
value: in many soils
type: LOCATION
Source sentences:
text: In many soils, earthworms play a major role in the conversion of large pieces of organic matter into rich humus, thus improving soil fertility.
text: Earthworms play a major role in the food chain.