What stage of metamorphosis features a nymph stage?

The stage of metamorphosis that features a nymph stage is associated with simple metamorphosis. In this type of metamorphosis, insects develop through a series of growth stages without going through a distinct pupal stage, which is a hallmark of complete metamorphosis.

In simple metamorphosis, the young insects hatch as nymphs, which resemble smaller versions of the adult but lack fully developed wings and reproductive organs. As nymphs, they undergo several molts, gradually growing and developing these adult characteristics over time. While both gradual and simple metamorphosis involve incomplete developmental stages, the term "nymph" is most specifically connected with simple metamorphosis, where the transformation from young to adult is smoother and continuous without a dramatic pupal stage.

Complete metamorphosis, on the other hand, involves distinct egg, larva, pupa, and adult stages, omitting the nymph stage entirely. Thus, the inclusion of a nymph stage clearly identifies simple metamorphosis as the correct classification in this context.