Each spinal nerve ____________________.
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   contains both sensory and motor fibers; | 
   
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   contains only sensory fibers; | 
   
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   contains only motor fibers; | 
   
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   is formed by the merger of the dorsal and ventral roots of the spinal cord; | 
   
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   both alternatives a and d are correct; | 
   INCORRECT - Spinal nerves contain both sensory and motor fibers.
   
   
   
   
   [Review Part 1 of the tutorial]
   [Review Part 2 (Matching) of the tutorial]