What will happen if molecular oxygen vanishes from the earth's atmosphere?

Lifeforms will be more protected

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Life on Earth will cease to exist

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There will be a boom in the growth of single celled organisms

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Cannot Say

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Solution

The correct option is B Life on Earth will cease to exist
All plants and animals on earth engage in a process called respiration. It is a process in which oxygen is the main constituent. Hence, if molecular oxygen vanishes from earth's atmosphere life on earth will cease to exist as there will be no respiration.

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