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What takes place when you inhale and exhale ?

Sagot :

oxygen comes in and carbon-dioxide comes out... maybe that can help u.. :)
By hypothesis, this may be helpful:
When you say 'takes place', then you mean an action within a reaction. So better if the answer is like this:

•When you inhale and exhale, what takes place is the exchange of gases that occur mainly in the alveoli. That process ic commonly called the respiration.