The majority of nitrogen in soil and marine environments is fixed by:
a. free-living bacteria
b. symbionts
c. E. coli
d. biofilm organisms
e. UV light
Answer: Free-living bacteria
The majority of nitrogen in soil and marine environments is fixed by:
a. free-living bacteria
b. symbionts
c. E. coli
d. biofilm organisms
e. UV light
Answer: Free-living bacteria
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