The answer is A  i hope thats helpful
        
             
        
        
        
(D)an atom can join with other kinds of atoms.
Basically he explained what a molecule is. 
 
        
        
        
Explanation:
In digestion, the liver is involved in processing the nutrients that are absorbed from the small intestine. It helps in the digestion of fat. 
On the other hand, the liver maintains homeostasis by serving an important function in the excretory system.
 
        
             
        
        
        
Answer:
we dont know sorry but i dont know
 
        
             
        
        
        
Answer:
Parasitism is a relationship between two different organisms where one of the organisms actually harms the other through the relationship. The organism that is harming the other one is called a parasite. Examples of Parasitism: Fleas or ticks that live on dogs and cats are parasites.
Explanation: