The answer to your question is Letter C   <-- ANSWER 
Steroid is a molecule made up of four carbon rings with other atoms bonded to those rings. 
Hope this Helps 
 
        
                    
             
        
        
        
<span>I believe the answer is: D. proteins
The main functions of these proteins is to allow specific substance to pass through the membrane of the cells which needed for the energy formation for cells'functions.It created through the combination of more than 20 amino acids with different functions.</span><span />
        
                    
             
        
        
        
Answer:
This process will harm marine life due to scarcity and reduction of oxygen levels. This will significantly harm the marine ecosystem as well.
 
        
             
        
        
        
Answer:
Improving food storage facilities
 
        
                    
             
        
        
        
Flight; fight
The sympathetic is used to speed things up, stopping things like digestion in order to supply more blood to the heart and lungs, while the parasympathetic does the opposite; digesting food and working on internal things while the heart rate and breathing rate slow.