Why do we yawn
And also that why the yawn is contagious which spread from one person to another
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Answer:
WE YAWN MOSTLY WHEN WE GET SO SLEEPY.
Explanation:
IT SPREADS FROM ONE TO ANOTHER AS WHEN WE SEE MANY PEOPLE YAWNING TOGEATHER OUR MIND SENDS A MESAGE TO REACT THE SAME LIKE THEM.
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