Why do arthropods need to shed their outer cover?
Answers
Arthropods have a thick layer of chitinous exoskeleton, also called epidermal layer. It is secreted by the upper epidermal cells below it. Chitin itself has a soft texture and elasticity. It is a high-molecular polymer composed of acetic acid, ammonia, and glucose, namely glucosamine acetate. However, the chitin of all arthropods (except the body segments and joints) has a large amount of calcium salt deposits, which increases the hardness of the body wall and appendages for the attachment of internal muscles and protects the internal organs. But because the hardness increases, there is no elasticity, and the chitin itself cannot decompose and expand itself, which hinders the growth of the arthropod body. "Adult".
PS molt is done under the action of its peeling hormone. If arthropod glands that produce ecdysone are destroyed or restricted, then the arthropods will not peel, but they will never live long.