Explanation:
making hypotheses is a scientific method 
 
        
                    
             
        
        
        
C) The core contains equal amounts of hydrogen and helium
        
             
        
        
        
<span>The reason behind the lipids which are able to function as protective barriers in cells is that lipids do not dissolve in water.
If lipids dissolve in water, they will not be able to function as protective barriers in cells. N</span><span>ucleic acids, proteins, lipids and carbohydrates are the four types of macro-molecules in the cell.</span>
        
             
        
        
        
A relatively constant internal physical and chemical conditions that organisms maintain.