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No, tress don't make oxygen they just convert carbon dioxide to oxygen. The reason we can't breathe is because there are small plants in space that have already converted all the carbon dioxide to oxygen and the astronauts who went to the moon took all the oxygen to the moon and used it there. As you know, when you use oxygen it produces carbon dioxide, but sadly there are no plants on the moon and the moon's gravity trapped all the carbon dioxide there. Now the only way to get more oxygen is to put animals in space so that there is an oxygen->carbon dioxide cycle.
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Yes, there are no trees, but, before trees came, even the Earth didn't have oxygen, but it had other types of air. Space is not a BIG thing that has gravity, so it can't pull the air to a certain place, so you can't breath because there's no air.
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there's nothing in space to breathe, space is a vacuum. there's no air there so we can't breathe becuase we need oxygen and other gases to do so.
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Because there is no air. It is a vacuum.
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It's because aliens used all the air.
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Let me dumb it down for you... There is no air, and we need air to breathe.
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My daddy says to me he needs his own space, I think he breaths fine (sounds like a pig snorting).
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No air