Explain the process of regeneration in $Planaria$. How is this process different from reproduction?

(N/A) $Planaria$ possesses the ability to regenerate its lost body parts. If the body of $Planaria$ is cut into several pieces,each piece can grow into a complete new individual. This occurs because specialized cells present in the body proliferate and form a mass of cells. These cells then undergo differentiation to form various tissues and organs,eventually developing into a complete organism.
Regeneration is not the same as reproduction because,in nature,most organisms do not rely on being cut or injured to produce offspring. Regeneration is primarily a mechanism for the repair of damaged tissues or the replacement of lost body parts,whereas reproduction is a biological process for the continuation of the species.