The answer to this is protein.
Hydrochloric acid in digestive system is found in stomach, which is the only main digestive organ with an acidic pH 2.
In the stomach, only one kind of the primary food substance is chemically digested, which is protein. It is digested with the help of enzyme Pepsin, which breaks protein chains into polypeptides.
After that, the other organs of the digestive system has more of a neutral to slightly alkali condition, which is not related to hcl. Therefore, the answer is protein.
        
                    
             
        
        
        
Answer:
The ecological effects of acid rain are most clearly seen in aquatic environments, such as streams, lakes, and marshes where it can be harmful to fish and other wildlife. As it flows through the soil, acidic rain water can leach aluminum from soil clay particles and then flow into streams and lakes
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Hope this helped <3
 
        
             
        
        
        
Answer:
I think it's A tell me if it's wrong
hope it helps
have a good day :)
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I believe the answer is spring
        
             
        
        
        
                 Within Ecosystems, Energy generally flows from 
                                               ✿ Sun ✿
                                                      
                                          ✿ Producers ✿
                                                      
                                  ✿ Primary Consumers ✿
                                                      
                                ✿ Secondary Consumers ✿
                                                      
                                   ✿ Tertiary Consumers ✿
               Among the Given Options Only Option C is True