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After oxygen is breathed in, it has to make its way to cells where respiration takes place.
Oxygen is one key ingredient in the reactions that get our cells energy, alongside the glucose we get from eating and digesting food.
We don't have oxygen, so...
One example we have on our planet, Earth, is oxygen.
Yes, artistic routines are done upside down, underwater, without oxygen.
We want to find a true Earth twin with continents oceans and sunlight and a thin atmosphere with oxygen, a place where we humans could potentially live.