Question

Microorganisms like bacteria and fungi keep the earth clean. How?

Answer 1

Yes,Micro organism helps to keep our environment clean because they help to compose the matter with natural process that is done by bacteria and in this way it helps in making manure for soil .This process is known as biodegrable.
  Microbes like bacteria and fungi break down complex pollutants into simpler substances to gain energy and nutrients .

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Answer 2

Microorganisms like bacteria and fungi help decompose dead plant and animal matter into humus or manure. This helps to clean our Earth while keeping our soil rich with nutrients. This process is called decomposition or bio-degradation.