Assertion: nitrogen | /r/HasProperty | useable
Facets:
value: to animals
type: TRANSITIVE-OBJECT
value: to plants
type: TRANSITIVE-OBJECT
Source sentences:
text: At frist nitrogen is called free nitrogen but when it goes through nitrogen fixation it can be useable.
text: Nitrogen is abundant in the atmosphere, but it is unusable to plants or animals unless it is converted into nitrogen compounds.