Assertion: nitrogen's form | /r/HasProperty | ammonia
Facets:
value: in aquatic organisms
type: OTHER
value: usually
type: DEGREE
Source sentences:
text: Nitrogen must first be processed, or "fixed", into a plant-usable form, usually ammonia.
text: In the wastewater field we are concerned with several forms of nitrogen: ammonia, organic, nitrate, and nitrite.
text: In aquatic organisms the most common form of nitrogen waste is ammonia, whereas land-dwelling organisms convert the toxic ammonia to either urea or uric acid.