How 'Rosie' considered different from a normal cow?

What is cancer? How is a cancer cell different from normal cell ? How do normal cells attain cancerous nature?

Answer the following question: How are the cancer cells different from normal cells?

How are viroids different from viruses?

How is variable different from a constant?

How is Cast iron different from Pig iron ?

How is respiration different from breathing?

How is artifical selection different from natural selection?

How is wrought iron different from steel?

How are pteridophytes different from phanerogams ?