Answer :
Microbes are responsible for oxygen production, nitrogen cycle and sulfur cycle.
The microbes like cyanobacteria are regarded as oxygen generators in the atmosphere. In the nitrogen cycle, bacteria are crucial. Bacteria that fix nitrogen turn atmospheric nitrogen into nitrates. Ammonia is produced when decomposing nitrogen waste is converted by bacteria. "Ammonia is converted to nitrates and nitrites by nitrifying bacteria."
While many bacteria can only partially reduce sulfur, other specialized bacteria can completely rely on sulfur for respiration. In their respiration, they employ sulfur or sulfate as an electron receptor and emit sulfide as waste. The oxidation-reduction and assimilation-dissimilation phases of the sulfur cycle in nature are crucially dependent on microbes.
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