Answer:
B is the correct answer I say
 
        
                    
             
        
        
        
Answer : The limiting reagent is 
Solution : Given,
Moles of methane = 2.8 moles
Moles of 
 = 5 moles
Now we have to calculate the limiting and excess reagent.
The balanced chemical reaction is,

From the balanced reaction we conclude that
As, 2 mole of 
 react with 1 mole of 
So, 5 moles of 
 react with 
 moles of 
From this we conclude that, 
 is an excess reagent because the given moles are greater than the required moles and 
 is a limiting reagent and it limits the formation of product.
Hence, the limiting reagent is 
 
        
             
        
        
        
I think it might be A. i am not totally sure though
        
             
        
        
        
Answer:
A. Chemical Reaction
Explanation:
Cellular Respiration is the chemical reaction in which glucose and oxygen are turned into water, carbon dioxide, and energy. 
 
        
             
        
        
        
Answer:
It is called a salt bridge