Assertion: nodule's rhizobium | /r/HasProperty | provided shelter
Facets:
value: in return for the fixed nitrogen
type: PURPOSE
Source sentences:
text: In return for the fixed nitrogen that they provide, the rhizobia are provided shelter inside of the plant's nodules and some of the carbon substrates and micronutrients that they need to generate energy and key metabolites for the cellular processes that sustain life (Sprent, 2001).