It can change one thing into onether witch sometimes can be bad
        
             
        
        
        
Answer:
Photosynthesis takes place in two stages: light-dependent reactions and the Calvin cycle. Light-dependent reactions, which take place in the thylakoid membrane, use light energy to make ATP and NADPH. The Calvin cycle, which takes place in the stroma, uses energy derived from these compounds to make GA3P from CO2.
Explanation:
<h3>I hope this helps!</h3>
 
        
             
        
        
        
I suggest looking it up on google
        
                    
             
        
        
        
Valves ensure blood flows toward your heart. Vein valves work to bring the blood that flowed down via arteries back up to your heart.