Answer:
Small uncharged polar molecules, such as H2O, also can diffuse through membranes, but larger uncharged polar molecules, such as glucose, cannot. Charged molecules, such as ions, are unable to diffuse through a phospholipid bilayer regardless of size; even H+ ions cannot cross a lipid bilayer by free diffusion.
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Mylenation - an insulator along the axon
        
             
        
        
        
Sorry if I am wrong
Answer:
 Food is broken down into nutrients.
Skeletal system 
 
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Option A - gyres is the correct answer.
 
        
             
        
        
        
It depends on which virus you are referring to specifically. Viruses come in many shapes and types; their variations are tremendous.
For HIV and Influenza, viruses acquire their envelops after maturation, during the budding off or detachment stage from the host cell.
Hope this helps! :)