Answer:
Reasonable Second step- 
Explanation:
The given single step chemical reaction is as follows.

Suppose a two-step mechanism is proposed for this reaction, 
The reaction occured in two steps they are as follows.


 
        
             
        
        
        
I would go with C because that seems like the best answer choice
        
             
        
        
        
Explanation:
Plant cells have a cell wall, as well as a cell membrane. In plants, the cell wall surrounds the cell membrane. This gives the plant cell its unique rectangular shape. Animal cells simply have a cell membrane, but no cell wall.
 
        
             
        
        
        
Answer:
a star shines due to thermonuclear fusion
Explanation: