In order to study the formation of cancer cells, you should study the life cycle of normal cells as cancer cells are abnormal cells. 
Actually, Normal cells grow, divides and died after an interval of time. And when this process is break down, cancer cells begin to form. They are usually old cells which don't die after their life cycle.
Hope this helps!
        
             
        
        
        
The uninoculated tube is considered to be a negative control
because a negative control is an effect of having to show no response. Am uninoculated
control is where  organisms are not being
inoculated such as having a culture bacteria of not being inoculated with an
organism.
 
        
             
        
        
        
<span> the sea floor is youngest near a mid </span>
<span>ridge and farther away. 
i think this is the answer</span>