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no longer used by species.
is answer 
 
        
                    
             
        
        
        
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In biology, cell theory is the historic scientific theory, now universally accepted, that living organisms are made up of cells, that they are the basic structural/organizational unit of all organisms, and that all cells come from pre-existing cells
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Explanation: its asking youngest to oldest, use the law of super position, layer c would be the oldest and layer B would be the youngest, 
definition of the law of super position- Law of superposition, a major principle of stratigraphy stating that within a sequence of layers of sedimentary rock, the oldest layer is at the base and that the layers are progressively younger with ascending order in the sequence. ... It is one of the great general principles of geology.
 
        
             
        
        
        
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tanong mo kay aling marites