Insects that undergo gradual metamorphosis initially resemble what?

Insects that undergo gradual metamorphosis, also known as hemimetabolism, have nymphs that closely resemble the adult form. This means that as these insects develop, they progress through various instars (stages), where they appear increasingly similar to the adult, but typically lack fully developed wings and reproductive structures. For example, a nymph may have the same body shape and features as an adult but may be smaller and not yet capable of reproduction.

The defining characteristic of gradual metamorphosis is that there is no distinct larval stage; instead, the young insects (nymphs) grow and molt into adults while maintaining a resemblance to the adult form throughout their development. This contrasts with complete metamorphosis, where the larvae (caterpillars or grubs) look entirely different from the adults (butterflies or beetles), undergoing a pupal stage where significant transformation occurs.

Thus, the correct understanding of gradual metamorphosis highlights that the initial form of these insects resembles their adult counterparts, making the first choice accurate.