During regeneration, modification of an organ to another organ is known as:

Explanation

There are two mechanisms of regeneration: morphallaxis and epimorphosis. (i) Morphallaxis involves the reconstruction of the whole body from a small fragment by reorganizing the existing cells. The regenerated organism is smaller than the original one, e.g., Amoeba. However, after the completion of the process, it grows and attains normal size after some time. (ii) Epimorphosis replaces a lost organ of the body by proliferating new cells from the surface of the wound or injured part. Regeneration of an appendage in an arthropod, arm in a starfish, and tail in a lizard occurs by the process of epimorphosis. Morphogenesis refers to the shaping of an organism by embryological processes of differentiation of cells, tissues, and organs and the development of organ systems according to the genetic "blueprint" of the potential organism and environmental conditions. Accretionary growth refers to the growth in the post-embryonic stage or adult stage, where the cells are unable to divide further as a result of differentiation. But at certain locations, there are some cells that are able to divide mitotically and replace the worn-out differentiated cells when needed.