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Regeneration is defined as the process of growing a full organism from its body part.

The examples of organisms which undergoes regeneration are: Hydra and Planaria.

When the body of planaria is cut into number of pieces, the each and every body piece can regenerate and results in formation of a complete planaria. The regeneration of an organism occurs by the process of growth and development. The cells of body part which has been cut down gets divides and makes a ball of cells. These multiple cells results in formation of tissues and forms organs again and results in regeneration of another Planaria. It can be explained with the help of the following diagram: