Friday, November 20, 2009

cns 2

Our nervous system evolved from a simple string of nerve cells that could only bring about the simplest reflex movements that why we easily move some part of our body.
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1 comment:

  1. jevsNovember 20, 2009 at 8:09 PM

    i can explain carefully with the help of visual and picture so they will know and understand what I'm explaining.

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