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Brain, why do you keep the light on    you are sleeping in the evening?(  ) A.while B.until C.Whe...

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Because their spine is in active use.  Because they are more easily affected by gravity.  Because they keep growing backwards.  Because their spine becomes more bent.  
In the long run, our brain probably works harder than our heart.  When our brain senses the spinning, we will feel dizzy.  The brains of the other mammals are as complex as those of humans.  Our feelings and emotions come from the most developed area in our brain.  

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