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We are three of the important gasses that make earth a safe place to live!
We are the other three.
I protect earth from other dangerous gasses. But I can't do it alone. the other gasses help as well. Without them Earth is inhabitable
I am mars and I live next to earth. My atmosphere is similar to earth's but not exactly the same. That is why you can't live on me.
Mars is the problematic one of the two.
My atmosphere has less oxygen than Earth. The reason for this is because life adds more oxygen into the atmosphere. I can't support life so therefore I have less.
What did I tell you? Problematic.
My chance to carry life was long since destroyed years and years ago by something called sputtering. Sputtering is when protons from the sun strike molecules in the atmosphere.
problematic since day one.