why air is only on earth
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There is air in space. BUT, the air is spread out that
virtually you cannot make use it as a source of air for your body.
The Earth has gravity, that pulls together oxygen near each other.
So why Earth have oxygen but not any other planets? Well, all
planets got some air but not as much to sustain life. Earth started
this way. A long long time ago, there was virtually no oxygen in the
planet.
Else:
Your answer is best
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because earth is a unique planet
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