Photosynthesis Is generally the opposite of cellular respiration. To drive the organisms metabolism photosynthesis has an exothermic reaction.
        
             
        
        
        
Answer: by the addition of one phosphate group
Explanation:
 
        
                    
             
        
        
        
Hi there!
The stage after Protostar would be - Sequence Star.
Hope this helps you!
~DL