Which best compares the roles of nitrogen-fixing bacteria and certain decomposers in the nitrogen cycle?

• Both organisms convert free nitrogen into nitrogen-containing compounds
• Both organisms convert nitrogen-containing compounds into free nitrogen
• The bacteria convert free nitrogen into nitrogen-containing compounds, while the decomposers convert nitrogen-containing compounds into free nitrogen
• The bacteria convert nitrogen-containing compounds into free nitrogen, while the decomposers convert free nitrogen into nitrogen-containing compounds.

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