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How does space give us oxygen?

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The oxygen we use everyday in a breathable form is not normally found in space beyond our own atmosphere. The plant ecosystem here converts carbon dioxide to oxygen. NASA must transport large containers of air for the astronauts to breath on space missions. Over last few years NASA and other space agencies have started using oxygen generators, some of which convert water to oxygen. These devices are very expensive and not very efficient, but are improving over time.
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How do plants give us oxygen?

Using the chemical process called photosynthesis, plants take in  carbon dioxide and break it down into carbon for use in making  chemicals the plants use, and oxygen which

How or where does a tree get oxygen to give us?

A tree absorbs carbon dioxide from the air, and, with the input of energy from sunlight, oxidizes many of the oxygen atoms of the absorbed carbon dioxide to elemental oxygen,

What do doctors use to give patients oxygen?

Oxygen is delivered via plastic tubes that either rest just outside of the nostrils or are inserted into the trachea in a patient that needs that sort of treatment.
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Do palm trees give us oxygen?

Well, all plants filter the air so there are no toxins in the air. As they do this, they produce oxygen. So, since palm trees are plants, they would naturally filter out the a