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all animals and plants(though only at night) use a process called respiration to produce energy. Animals breath in air(which is, approxamentaly, 78% nitrogen, 21.5% oxygen, 0.3% Argon and less than .04% carbon DiOxcide. This air is taken in, and animals extract about 5% of that oxygen for giving life to all the cells in our bodies. When we exhale, the air hasn't changed alot. Its, approxamentaly, 78% nitrogen, 16.5% oxygen, .3% Argon, and roughly 5% carbon DiOxcide AND OTHER GASSES. So the short answer to the question is that we breath out what we breath in.

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