For the purpose of life history, the insects maybe divided into three groups, the Ametabola, the Hemimetabola and the Holometabola. The Ametabola This division includes four orders of small wingless insects: the Diplura, the Thysanura, the Collembola, and the Protura. The young hatch from the egg with the adult form of body; they differ from the adult only in their size and their sexual immaturity