This might help,the presence of hydrochloric acid creates an acidic environment within the stomach that is needed to convert pepsinogen to pepsin. Mucus that is produced by the epithelial cells of the stomach help protect the lining of the stomach from the corrosive hydrochloric acid and pepsin.
 
        
                    
             
        
        
        
Answer:
i had to list all the facts cuz we didnt have a diagram 
Explanation:
The mantle is the mostly-solid bulk of Earth's interior. The mantle lies between Earth's dense, super-heated core and its thin outer layer, the crust. The mantle is about 2,900 kilometers (1,802 miles) thick, and makes up a whopping 84% of Earth's total volume.
 
        
             
        
        
        
B cytoplasm passes light threw the eye
        
             
        
        
        
Prokaryotic cells because they don't have a nuclei.