Why Do We Breathe Out Carbon Dioxide?

Answer

We breathe out carbon dioxide because it is a by-product of the process of cell respiration. The air that we normally breathe out as carbon dioxide comes from the carbon in the food we eat.
1 Additional Answer
We breathe in Oxygen which is utilized to make Heat of carbohydrates. Making heat is nothing but Combustion reaction. In combustion reaction CO2 is emitted. Hence we breathe out Carbon Dioxide.
Q&A Related to "Why Do We Breathe Out Carbon Dioxide"
Water vapour.
http://wiki.answers.com/Q/When_we_exhale_we_breath...
Because your body is mostly carbon and water so when you breathe oxygen molecules meet up with carbon and form carbon dioxide.
http://answers.yahoo.com/question/index?qid=201207...
Oxygen leaves the lungs and enters into your blood via gas exchange. (There is a much higher concentration of oxygen in the lungs than the blood causing it to diffuse). The oxygenated
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Exhaled air contains about 4.5-percent carbon
http://www.chacha.com/question/when-we-exhale-we-b...
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