Motor neurons carry impulses to the effectors in the body, which are the muscles or glands that produce a change based on a stimulus sensed by the receptors. The motor neurons "innervate" muscle fibers, which essentially means that they cause them to move. The fewer the muscle fibers associated with a motor neuron, the more precise are the movements of those fibers. Having to control a small number of fibers, the neuron is able to coordinate more dexterous motions. An example of a region where there are not a lot of muscle fibers related to each neuron is in your fingers.
        
             
        
        
        
I think A is most likely but if not D
        
             
        
        
        
Answer:
Genotype is what you can’t see physically and phenotype is the physical characteristics of that organism.
Explanation:Genotype is known as the genetic makeup of an organism. Think the genes behind what your seeing.
 Phenotype is the physical characteristics of an organism. For example:freckles,eye color, open or closed earlops..... things of that nature.