Imagine what happen if there are no micro organism.
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Solution
Microorganism mainly bacteria decomposes dead bodies of the living organisms if they don't decompose they will smell which may be disturbing to the society.
Microorganisms are responsible for oxygen in the air because even trees take oxygen from them for their breathing because trees are not responsible for oxygen certainly microorganisms are.
Hence microorganisms are responsible for every living organism. Without them, there is no life.