Which of the following stages are present in simple metamorphosis?

In simple metamorphosis, the developmental stages consist of egg, nymph, and adult. This process is characterized by the absence of a pupal stage, which differentiates it from complete metamorphosis that includes four distinct stages: egg, larva, pupa, and adult.

After the egg hatches, the nymph emerges, which resembles a smaller version of the adult but is not fully developed. As the nymph grows, it undergoes a series of molts, gradually maturing into the adult form. This method of development allows nymphs to continue to exhibit similar characteristics to the adults even during their growth stages, reflecting how they adapt to their environment as they mature.

Other options include stages that are either not part of simple metamorphosis or include stages not applicable to this process, such as the pupal stage or the larval stage, which are associated with complete metamorphosis instead. Thus, egg, nymph, and adult accurately represent the stages in simple metamorphosis.