<span>A retrovirus is anything of a group of RNA viruses that insert a DNA copy of their genome into the host cell to replicate.
your welcome 
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Answer:
I think it is called selective breeding, I don't think it is called that but hope this helps
 
        
                    
             
        
        
        
Answer:
part A is the answer
Explanation:
The tympanic cavity is an air chamber; it contains a chain of movable bones which transmit the vibrations of the tympanic membrane across the cavity to the middle ear.
 
        
             
        
        
        
The first stage of cellular respiration is glycolysis. It takes place in the cytosol of the cytoplasm. <span>The word</span><span> </span><span>glycolysis</span><span> </span><span>means “glucose splitting,” which is exactly what happens in this stage. Enzymes split a molecule of glucose into two molecules of pyruvate (also known as pyruvic acid). This occurs in several steps, as shown in</span><span> </span><span>Figure</span><span> </span><span>below</span><span>.</span><span> </span>
 
        
             
        
        
        
Answer:
go for the second answer idk may be right i think
Explanation: