Assertion: living diatom | /r/CapableOf | contribute half of the organic material
Facets:
value: nearly
type: DEGREE
Source sentences:
text: Living diatoms make up a significant portion of the Earth's biomass: they generate about 20 to 50 percent of the oxygen produced on the planet each year, take in over 6.7 billion metric tons of silicon each year from the waters in which they live, and contribute nearly half of the organic material found in the oceans.