Answer:
external 
Explanation:
<em>Through the process of photosynthesis, plants use the sun's energy to make sugars to function. External means from an outside force, while internal means from within. Since the sun isn't inside a plant, they gather it from outside, thus it's external.</em>
 
        
             
        
        
        
Answer:
Photosynthesis makes the glucose that is used in cellular respiration to make ATP. The glucose is then turned back into carbon dioxide, which is used in photosynthesis. ... While photosynthesis requires carbon dioxide and releases oxygen, cellular respiration requires oxygen and releases carbon dioxide.
Explanation:
 
        
             
        
        
        
Skin. hair. nails. hope these helped!
        
                    
             
        
        
        
It is system because bone nucleus and all the rest you put down are all a system structure in the body