A: Homeostasis
Reason: cell membrane has nothing to do with question and C and D are terms for sugars
        
                    
             
        
        
        
Answer:
The best answer is R group. An R - group is a chemical group or side chain that is found attached to the central carbon in amino acids
Explanation:
 
        
                    
             
        
        
        
I’m not sure but I think DNA
        
             
        
        
        
Answer:
anorthosite, it is an anorthosite, composed mostly of a type of plagioclase feldspar known as anorthite.