How is our atmosphere different from the atmospheres on Venus and Mars?

How is our atmosphere different from the atmospheres on Venus and Mars?

Answer:

Earth’s atmosphere is a mixture of nitrogen (79%), oxygen (20%), and a small fraction of carbon dioxide, water vapours and other gases. This makes the existence of life possible on Earth. However, the atmospheres on Venus and Mars mainly consist of carbon dioxide. The amount of carbon dioxide on these planets can range from 95% to 97%. This may be the reason, no life exists in these planets.

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