What type of metamorphosis involves no drastic change between the young and adult stages?

The correct choice is that the type of metamorphosis involving no drastic change between the young and adult stages is known as simple metamorphosis. This process, also referred to as ahemimetabolous metamorphosis, occurs in certain insect groups, where the young, or nymphs, resemble smaller versions of the adults. As they mature, these nymphs undergo a series of molts but do not go through stark physical transformations characteristic of complete metamorphosis.

In simple metamorphosis, the life stages include egg, nymph, and adult, with the nymphs gradually growing and developing into adults without significant changes in form. This is in contrast to other types of metamorphosis, where there are pronounced differences between the life stages, such as larval forms that morph into completely different adult forms. Consequently, this gradual development is significant as it reflects a more straightforward evolutionary adaptation compared to more complex forms of metamorphosis that involve distinct larval stages, like caterpillars turning into butterflies.