Either, carbon, hydrogen, nitrogen, oxygen, phosphorus, or sulfur. I would go with carbon because of the photosynthesis and cellular respiration<span />
        
                    
             
        
        
        
Answer:
<h3>male and female reproductive cells </h3>
Explanation:
<h3>I hope it helps ❤❤</h3>
 
        
                    
             
        
        
        
Because it carries a lot of blood to the arteries