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manu v
Open Question
Apr 25, 2009, 1:08 am
why do we yawn 
 

   
   

Answers  (2)


RP 		Apr 25, 2009,11:53 am
As far I know Its due to lack of oxygen

 
 


Vidya 		Jul 25, 2009,2:24 pm
First of all we yawn when we feel sleepy that means our body is fatigued. Also I have heard that we yawn when our brain needs oxygen.

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