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    Why do we Yawn?

    0  Views: 323 Answers: 2 Posted: 11 years ago

    2 Answers

    It is something that is not fully understood, some say it is an early form of communication, notice that when you yawn, it is contagious, person next to you yawns. I don't believe that it is to draw in more oxygen, or else we would yawn after a run rather than pant.
    its a lack of oxygen to our brains


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