What are two roles prokaryotes play in the cycling of elements in an ecosystem

Prokaryotes have a significant role in decomposition of organic matter, bringing back key nutrients into the trophic network. By decomposing dead plant or animal parts, they enable the circulation of elements like phosphorus and sodium.
On the other hand, specialized bacteria have a role in transforming nitrogen compounds in the soil, converting them into chemical forms that are suitable for other organisms to use.

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I'm guessing that it's referencing the common folk or people of town or the people who are in the middle of the social and economical hierarchy