Answer:
C
Explanation:
Nuclear fusion is the process by which the Sun produces its energy. It converts mass into energy, which is radiated over most of our solar system. The pressure from the fusion reactions keeps the star from collapsing. 
Without the Sun's energy, in the amount we receive, the Earth would likely be entirely frozen and beyond deathly cold. Take Pluto as an example :)
 
        
                    
             
        
        
        
Answer:
The nervous system helps the body to maintain homeostasis by controlling and regulating the other parts of the body.
 
        
             
        
        
        
Answer:
It's probably 50%
Explanation:
Since Bb is repeated twice, it is 50%. 
Hope this helps!