Answer:
I would say B. digestive system.
Explanation:
The digestive system breaks down food and processes it into energy molecules that the body of an organism can use. 
Hope this helps! :)
 
        
             
        
        
        
None of the above... Ingumentary system is the one that regulates body temperature. The ingumentary system is skin, hair , sweat glands and nails
 
        
                    
             
        
        
        
The first answer is homeostasis so d 
The second answer is organelle so c
        
             
        
        
        
Answer: A( adenine) G (Guanine) C (Cytosine) T (Thymine) U (Uracil)
Why? Nucleic acids are polynucleotides—that is, long chainlike molecules composed of a series of nearly identical building blocks called nucleotides. ... Each nucleic acid contains four of five possible nitrogen-containing bases: adenine (A), guanine (G), cytosine (C), thymine (T), and uracil (U).
        
             
        
        
        
First, it belongs to the digestive system, since it's also called the large intestine.  Sorry, but I don't know what else it belongs to .
I hope this helps somewhat