They are useful cause you need to find the data with no graphs no data
        
                    
             
        
        
        
It’s a term for molecules present in organisms that are essential to one or more typically biological processes, e.g. cell division.
        
             
        
        
        
Answer:
i think B. 
Explanation:
That destroys a habitat for many species
 
        
             
        
        
        
The white blood cells protect the body against both infectious disease and foreign invaders.
        
                    
             
        
        
        
Answer:
Sleep apnea.
Explanation:
Sleep apnea:
Sleep apnea is considered as serious sleep disorder in which patient's breathing during sleep repeatedly stop and start along with snoring. 
So, here the scenario that Sarah's grandfather is suffering from sleep apnea because he takes nap on recliner and suddenly stop snoring and stop breathing and again resume the breathing along with snoring.