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How many different pieces are involved with the simple task of breathing ?and why is it shocking to a lot of people?

How many different pieces are involved with the simple task of breathing ?and why-example-1

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A person usually breathes an average of 13 pints of air every minute.
Lungs aren't the same size. To accommodate the heart, the right lung is larger than the left lung — for humans, that is.
Lungs float on water. ...
Lungs and tennis courts can be the same size. ...
Oxygen only plays a small part in breathing.
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