Assertion: nitrogen's form | /r/HasProperty | usable
Facets:
Source sentences:
text: Here, Atmospheric nitrogen (N2)which is primarily available in an inert form, is converted into the usable form -ammonia (NH3).
text: Atmospheric nitrogen cannot be used by most organisms and must be converted into a usable form.
text: The nitrogen in plants, for example, is in a usable form, so when they drop leaves, seeds or simply die, the nitrogen returns to the soil for other plants to use.
text: When nitrogen is converted into its usable form, it is said to be fixed, and plants and algae incorporate the nitrogen into amino acids, proteins, and deoxyribonucleic acid (DNA).