Photosynthesis and cellular respiration are related in that; photosynthesis is a process that is tasked in making glucose which is then used in cellular respiration to make ATP. The glucose is then converted to carbon dioxide during cellular respiration, which is used in photosynthesis. Water on the other hand is broken down to form oxygen during photosynthesis, in cellular respiration oxygen is  combined with hydrogen to form water.
        
             
        
        
        
I'll say C, Science cannot answer difficult question...let me know.
        
                    
             
        
        
        
Question 1:  C.
Question 2: C.
Question 3: D.
Question 4: A.
Question 5: A.
        
                    
             
        
        
        
3 nucleotides code for an amino acid
        
             
        
        
        
HEY MATE....!
HERE'S THE ANSWER 
Diffusion is a process in which particles of two or more substances intermixed with each other.
HOPE IT HELPS....