Why do we yawn....????
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Answer:
Even thinking about yawning can cause you to do it. It’s something everybody does, including animals, and you shouldn’t try to stifle it because when you yawn, it’s because your body needs it. It’s one of the most contagious, uncontrollable actions a body does.
There are many theories as to why people yawn. One popular theory is that yawning helps your body bring in more oxygen. But this theory has been mostly debunked.
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Explanation:
when we bored or tired, we just don't breathe as deeply we yawn....
yawning helps us to bring more oxygen into the blood and move more carbon dioxide out of the blood
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