ocr: INSECTS NSECTS are the largest group of form. This is called metamorphosis. arthropods. Ani insect has a body In complete metamorphosis, the divided into three parts: a head,a adult, such as a butterfy, looks totally thorax, and an abdomen. The head different from the larva (preadult has a pair of antennae and compound form), such as a caterpillar. The larva eyes. Attached to the thorax are three turns into a pupa, and the pairs oflegs, and normally two pairs adult emerges from ofwings. During their life, this. In animals that insects change their body undergo incomplete metamorphosis, the Abd ...