Cancer is unchecked cell growth. Mutations in genes can cause cancer by accelerating cell division rates or inhibiting normal controls on the system, such as cell cycle arrest or programmed cell death. As a mass of cancerous cells grows, it can develop into a tumor
        
             
        
        
        
when replication mistakes are not corrected they may result in mutations which sometimes can have consequences
        
                    
             
        
        
        
I don't know answer, but my answer is the leaf segments, whole communities, and plant dominated aquatic ecosystems and present contemporary methods tailor made to quaintly photosynthesis and carbon fixation underwater.
        
             
        
        
        
Your answer could be Chemical
Touch would be the feeling of the perfume/ touch
Light would be the vision 
Sound would be the hearing/ sound 
Hopefully, this make it more understanding