What type of metamorphosis involves stages of egg, nymph, and adult?

The correct choice describes gradual metamorphosis, which is characterized by a developmental process that includes three distinct stages: the egg, the nymph, and the adult. In this type of metamorphosis, the nymph resembles a smaller version of the adult and goes through a series of molts to become fully developed. This contrasts with complete metamorphosis, where organisms undergo four stages: egg, larva, pupa, and adult, resulting in a significant transformation in structure and form between the larval and adult stages.

Gradual metamorphosis is typical in many insects, such as grasshoppers and cockroaches, allowing them to develop incrementally as they mature, rather than undergoing a dramatic transformation as seen in complete metamorphosis. This method of development is well-adapted to their environments, permitting the nymphs to utilize similar resources to adults and enhancing their survival chances.