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You are probably thinking of oxygen and something else, but there are no gasses in the atmosphere universally essential for life. In fact oxygen which is essential to our lives is a deadly poison to many forms of microbial life! Even for us oxygen is toxic and we have a very complex system to keep repairing the damage caused by the toxic effects of the oxygen we need to live!

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8y ago
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14y ago

nitrogen (N) 78% and Oxygen (O) 21% which makes 99 percent and the 1% is Billion other little gases!

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15y ago

oxygen and carbon dioxide

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13y ago

Hydrogen & Oxygen

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14y ago

oxygen and carbon dioxide

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11y ago

Oxygen and carbon dioxide

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Q: What are most important gases for life?
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