Why humans beings yawn???
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A yawn is nothing but an extra-deep breath that help to get more oxygen in our lungs. Sometimes when we are tired , sleepy or have been sitting for long time ,our breathing became quite and shallow
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One is that when we are bored or tired, we just don't breathe as deeply as we usually do. As this theory goes, our bodies take in less oxygen because our breathing has slowed. Therefore, yawning helps us bring more oxygen into the blood and move more carbon dioxide out of the blood.
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i hope it is helpful for you
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