 In this module, we will see how does the process of ectdysis takes place. Ectdysis process is very important for the growth of the arthropods. We have discussed in detail that virtually animals cannot complete the process of ectdysis. For this ectdysis, we have to see how this process will take place. We divide the process of ectdysis into four stages. The first stage is the production of different types of enzymes. These enzymes will be produced with hypodermal glands. The old ectdysis will start to digest slowly. The hypodermal glands will separate the exoskeleton. In the second stage, the new ectdysis and the apic ectdysis will be secreted. In the third stage, the old exoskeleton will be split. After split, ectdysis will open along the predetermined ectdyser lines. In that stage, the animal will stretch itself. If it is in the air, it will stretch itself in the air. If it is in the water, it will stretch itself in the water. In the fourth stage, the calcium carbonate will be present. This will deposit. In the result of that, the process of secretization will begin. In the result of the secretization, the new exoskeleton will gradually start to become hard. During the few days of hardening, after a few days of hardening process, the orthropods are vulnerable to attack to predators as well as different hazards to the environment. With this diagram, we will explain how the process of ectdysis will be in the orthropods. First of all, you see its body layers. Hypodermis, Procutical, Epicutical. In the first stage, enzymes will be secreted by the hypodermis. Glans, in the result of this enzyme, usually some digestion structures will occur. After the digestion of the structure, in the next stage, the molting gel will appear and slowly damage the structure due to the enzymes secreted by the hypodermal glands. These are the hypodermas. There are different glands present here. They secrete the enzymes. Now this molting gel is starting to increase here. What will happen if it increases? New cuticle and Procutical will appear. Now with the new cuticle and Procutical appearing, in the next step, the old Epicutical and Procutical that is now shedding off. When the new layer is formed in it, of Epicutical and Procutical, the old layers of Epicutical and Procutical gradually shed off. When they shed off, in the new Epicutical for the canals, the new layers of Epicutical slowly start to increase. The new layer of Epicutical and Procutical formation is completed. Through this diagram, we can explain how ecdysis occurs in exoskeleton of the different animals of phylum, Arthropota.