The answer is; cancer occurs due to unregulated cell division
This causes them to proliferate causing a mass of cells and affect neighboring tissues. The cells are usually undifferentiated and therefore do not function properly as tissue. This unregulated division is due to malfunction of the tumor suppressor gene that is significant in cell cycle regulation and apoptosis. 
 
        
             
        
        
        
B.) is the answer. I think it is. I'm not completely sure. But I think this is the right answer. Can you mark me brainliest if it is please.
 
        
                    
             
        
        
        
Natural selection is the differential survival and
reproduction of individuals due to differences in phenotype. It provides a
viable explanation for adaptation and speciation as it explains the change in
heritable traits characteristic of a population over time.  Changes that allow an organism to better adapt
to its environment will help it survive and have more offspring. Natural
selection can change a species in small ways, causing a population to change
color or size over the course of several generations. Given enough time and
enough accumulated changes, natural selection can create entirely new species. It
can turn dinosaurs into birds, amphibious mammals into whales and the ancestors
of apes into humans.
 
        
                    
             
        
        
        
Glucose is a simple monosaccharide sugar molecule with a chemical formula C6H12O6.
        
             
        
        
        
D. Since first you think of what will happen if this and this happen and then you test it.