A. Moisten and filters incoming air
        
                    
             
        
        
        
The answer is D. Extracellular,
the main ions involve in osmoregulation in a cell are sodium and chloride. Intra-and extracellular distribution of K+ is
influenced, for example, by Na+/K+-ATPase
function, pH, Cellular catabolism and anabolism, Insulin and glucose. Parathormone
and calcitriol are important in the homeostatic regulation of phosphates. 
 
        
             
        
        
        
According to my research it’s C: Nucleus
        
                    
             
        
        
        
Obviously sun plants are increasing more than shade plants by Light intensity and Rate of Photosynthesis. The Shade plants are decreasing by Light intensity
        
             
        
        
        
Option B. A man pushes a couch across the room is the answer.