13. Biological N fixation is carryed ou by: OSome bacteria and achaea but never by ekaryotes ODenitroreductase and nitrogenase enzymes ORhizobium-legume symbiosys and free living diazothophs OUnicelluar eukariotes, bacteria and achaea OSome types of micro algae OProkaryotes carrying nitrogenase enzymes OUnicellular microbes carrying denitroreductase enzymes

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Q: None

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