What is the change of body form is insects called?

The change of body form in insects is called metamorphosis. This process can be classified into two main types: complete metamorphosis (holometabolism), where insects undergo distinct life stages including egg, larva, pupa, and adult, and incomplete metamorphosis (hemimetabolism), where they transition through nymph stages before reaching adulthood. Metamorphosis allows insects to occupy different ecological niches during their life cycle.