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All animals need oxygen to live. Land animals get oxygen from the air. Without the oxygen in the air we cannot survive more than a few minutes. Breathing happens automatically, we do not have to even think about it.
We breathe in order to take oxygen into our bodies and get rid of carbon dioxide. The oxygen is carried in the blood to all the body's cells. The air we breath out has 100 times more carbon dioxide than the air we breath in.
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