why does man yawn?
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Answer: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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Yawns are considered a sign of boredom or sleepiness , and that could be what early humans were communicating as well . However early humans may have used yawning to signal their alertness to others , bare their teeth to aggressors , or serve as some other communication tool.
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