I think it’s the third option, I’m really sorry if that’s incorrect!!! You might wanna wait for someone else to answer :)
        
                    
             
        
        
        
Answer:
Surface area
Explanation:
The surface area to the volume ratio gets larger as the cell gets smaller and vice versa. 
 
        
             
        
        
        
Answer:
The correct option is number 3.  A deficit of appositional bone growth would not be life threatening.
Explanation:
Appositional bone growth can be defined as the thickening of the bones due to increase in the number of bone tissues at the surface. In this kind of bone growth, the diameter of the bone increases rather than the length of the bone. This can lead to deformation of the bone but it is not life-threatening.
Rest of the options 1, 2 and 3 are serious disorders and can eventually lead to death. 
 
        
             
        
        
        
Only autotrophs can convert solar energy into chemical energy