Answer:
The Sun produces a light by nuclear reaction called fusion.
Explanation:
Atoms of hydrogen combine to form helium, they produce vast amounts of heat and light.
 
        
             
        
        
        
True 
Hormones released by the endocrine system travel in the blood until they find their specific target cell it is true.
hope this helps!
 
        
                    
             
        
        
        
Option B, "They need more oxygen to function, so gas exchange needs to increase. "