[CBSE AIPMT 1999]
Correct Option (b)
Reason : Metamorphosis (meta=change, morphe=form) is a process by which an animal undergoes a comparatively rapid change from larval to adult form.
Regeneration is regrowth of the part of body which has been removed due to the injury or other causes. Growth is an increase in dry mass of an organism.
Ageing is progressive deterioration in activity of cell, tissues, organs, etc.