Which organisms play key roles in the cycling of nitrogen,carbon,and sulfur?

Question

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Bacteria play key roles in the cycling of nitrogen, carbon, and sulfur. Nitrogen-fixing bacteria convert atmospheric nitrogen into a form that plants can use, decomposer bacteria break down dead organic matter and release carbon and sulfur back into the ecosystem, and denitrifying bacteria convert excess nitrogen into atmospheric nitrogen, completing the nitrogen cycle.

Which Organisms Play Key Roles in the Cycling of Nitrogen,carbon,and