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Answer:

We breathe in air which has a higher concentration of oxygen than carbon dioxide and we breathe out air with a higher concentration of carbon dioxide. Both the gases are present in the inhaled and the exhaled air.

homeworkhelp76

Answer:

People do not only breathe in oxygen.

Explanation:

In fact, when breathing in normal air, you only take in about 21% oxygen, the rest of the gasses being mainly nitrogen (about 79%). As for breathing out, it is mainly carbon dioxide, but there are a couple more gasses in there.

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