The answer to the first question is a.
        
                    
             
        
        
        
Phospholipid bilayers are critical components of cell membranes. The lipid bilayer acts as a barrier to the passage of molecules and ions into and out of the cell. However, an important function of the cell membrane is to allow selective passage of certain substances into and out of cells. 
 
        
             
        
        
        
Answer:
A
Explanation:
If it's a permeable membrane then it will allow certain molecules in. If it's impermeable then it won't allow molecules in. Therefore it is the deciding feature of whether something can go into the membrane. 
 
        
             
        
        
        
Carbon, hydrogen, oxygen, nitrogen, phosphorus, sulfur
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Being in nature or even viewing scenes of nature reduces anger fear and stress and increases pleasant feelings. exposure to nature not only makes you feel better emotionally it contributes to your physical well-being reducing blood pressure and heart rate muscle tension in production or stress hormones