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August 2, 2015

Homework Help: biology

Posted by satyajit on Saturday, September 14, 2013 at 11:00pm.

A person(between 11-17) gets up and goes somewhere after sitting 20 mins in a place then he stops at a place for his work but a blackish region surrounds his face for 5secs and he falls on the ground ?after 10secs he feels that now his brain is ok and he gets up but with a heavy brain !What may be the reason behind his feeling of brain as he feels it often???
PLZ ANSWER !!!!!!!!!!!!!!!!

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