Question

why do we exhale only carbondioxide​

Answer 1

Answer:

In a nutshell, we release carbon dioxide when we exhale because it's produced in the cells of our body in order to break down the food that we eat and subsequently produce energy for sustaining life.

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Answer 2

Answer:

When we exhale, we breathe out less oxygen but more carbon dioxide than we inhale. The carbon we breathe out as carbon dioxide comes from the carbon in the food we eat. ... The glucose molecule is then combined with oxygen in the cells of the body in a chemical reaction called "cellular oxidation