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                              Q:
                           
                           
                                                      | A) meninges | B) skin | 
| C) bone | D) all the above | 
                              Answer:   D) all the above
                              
                                                            
                              
Explanation:
                               
                           
                           Explanation:
The central nervous system ( brain and spinal card ) are invested with the meninges which nourish and protect the system .This again is enclosed inside a bony box which has the skin above it
 
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