No, although a decreas ein gases may be essential for the formation of life as we know it. But in its native form, Oxygen is a highly corrosive gas, so imagine what the world was like when the entire plant kingdom start exhaling acid. Life adapted, and so this increase in gas made it one of the foundations for most animal life. So less gas isn’t necessary, but the current atmosphere means differnet life will form.
I hope this helped.
Maybe. In early experiments where scientists tried to simulate the pre-biotic chemical reactions necessary to produce the DNA and RNA bases, it was found necessary to have a reducing atmosphere.
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