Final answer:
The Ametabolous metamorphosis group sees no drastic change from juvenile to adult, unlike Holometabolous and Hemimetabolous metamorphosis, which feature complete and incomplete transformations with significant changes in form.
Step-by-step explanation:
The group of organisms that makes no drastic change in form from juvenile to adult is the Ametabolous metamorphosis group. In this type of metamorphosis, the insect hatches from an egg and develops through a series of molts, each time shedding its exoskeleton and growing slightly, but it does not undergo significant changes in body form. The adult looks pretty much like the earlier larval stages. This contrasts with Holometabolous and Hemimetabolous development, where insects undergo complete and incomplete metamorphosis, respectively. For example, Holometabolous insects like butterflies emerge from a pupal stage, while Hemimetabolous insects like grasshoppers develop from wingless immatures known as nymphs that go through successive molts until they reach the adult form.