A. after having cowpox they where immune to smallpox HOPE THIS HELPS
        
                    
             
        
        
        
Answer:
Cellulose-digesting microorganisms live in the guts of termites and ruminant mammals. the microorganisms have a home and food, and their hosts gain more nutrition from their meals. this relationship is an example of mutualism.
Explanation:
Mutualism encompasses the ecological relationships between individuals of different species, in which both gets benefits and improve their biological functions. It usually occurs between species that have different nutritional and living requirements. 
An example of this is also the nitrogen fixing bacteria (Rhizobia) and the legimunous plants, and the relationship between the Acacia and the Acacia ants.
 
        
             
        
        
        
I believe it is A (Adenine)
        
                    
             
        
        
        
Answer:
Thermal energy also known as “heat energy” comes from a substance whose molecules and atoms are vibrating faster due to a rise in temperature. 
Explanation:
 
        
             
        
        
        
<span>Commensalism is an interaction in which one of those species would benefit, and the other one would not be affected. Parasitism is an interaction in which one of those species would benefit at the expense of the host organism. Thus, in commensalism we have one positive and one neutral result while in parasitism we have one positive and one negative result.</span>