what is incomplete metamorphosis
1 Incomplete metamorphosis: a change in body form with three stages: egg, nymph, and adult. 2  Nymph: young stage of insects that undergo a partial metamorphosis; similar to the adult except that wings are not fully developed.nsects that go through three stages of change in their life cycle have an incomplete metamorphosis while complete metamorphsis has four stages. The first stage of incomplete metamorphisis is the egg.