What is a defining feature of incomplete metamorphosis?

A defining feature of incomplete metamorphosis is that organisms develop directly into their adult form without going through a pupal stage. Insects that undergo incomplete metamorphosis, such as grasshoppers and cockroaches, progress through egg, nymph, and adult stages. The nymphs resemble smaller versions of the adults and gradually grow and molt until they reach maturity, which is characterized by their full adult features.

The concept of incomplete metamorphosis emphasizes continuous development, as the nymphs progressively take on the characteristics of the adults rather than undergoing a complete transformation that includes a distinct pupal stage, which is a hallmark of complete metamorphosis seen in insects like butterflies and beetles.