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Nitrogen gas can’t be…
used directly by most organisms, so it is fixed into more readily available forms.
Diazatroph
nitrogen-eating bacteria
2 types of Diazatroph
symbiotic- in root nodules of legumes
free living- in soil
what processes occurred before oxygen was enriched?
fermentation
anaerobic respiration (uses something other than oxygen as an electron acceptor)
some photosynthesis (with something other than H2O as an electron donor)