Assertion: earthworm's role | /r/HasProperty | major
Facets:
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: Although litter-burying (anecic) earthworms appear not to be as prevalent in tropical as in temperate climates (Lavelle, 1983), in oligotrophic tropical forests where communities are dominated by litter-feeding epigeic and anecic species, earthworms may have a major role in plant litter decomposition and incorporation (Fragoso and Lavelle, 1995).
text: Earthworms play a major role in the food chain.