Cell differentiation is the process by which cells specialize to achieve their required functions. In order for a cell to differentiate, it will express specific genes. ... Importantly, mitosis produces cells that are identical to each other (clones).
 
        
             
        
        
        
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i think it's bacteriophage
 
        
             
        
        
        
Vestigial structures are often homologous to structures that are functioning normally in other species. Therefore, vestigial structures can be considered the evidence for evolution, the process by which beneficial heritable traits arise in populations over an extended period of time.
        
             
        
        
        
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A. As a young naturalist, Charles Darwin traveled around the world and made many discoveries on a small British navy ship, HMS Beagle.
 
        
                    
             
        
        
        
C, bushes and shrubs, mosses, lichens, grasses and annual flowers, trees 
hope I helped