We inhale O2 and exhale CO2, so does that mean we just add carbon and exhale the same oxygen we just inhaled? Why cant we just exhale carbon?
In: Biology
Only a sith deals in absolutes.
Our bodies are not 100% efficient.
We do not use up all the oxygen in each breath of air that we take into our lungs. What we breath out, is not just the waste that our body has ejected from our lungs after use, but the unused breathe we just took in as well.
Air is made up of more than just O2 as well.
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