D: All the variables are controlled except one.
        
                    
             
        
        
        
Answer:
Her eyes send signals to the brain. Her brain gets the signal and sends another one through her nerves to her muscles. Her muscles then move her arm or leg toward the ball to try and block it. 
Explanation:
Simple science. If I could help you, you are welcome. if I couldn't I'm sorry.
 
        
             
        
        
        
Cells are very different but have similar properties
        
             
        
        
        
When in space it is a meteorite. When it is entering the atmosphere, it is a meteor. When it hits the earth it;s classified as a meteoroid. 
Hope this helps.