What must the crab do to its skeleton whenit needs to grow?

When a crab needs to grow, it must molt its exoskeleton, which is a rigid outer structure that does not expand. During the molting process, the crab secretes a new, softer exoskeleton underneath the old one, then it sheds the old shell. After molting, the new exoskeleton hardens, allowing the crab to grow larger. This process is essential for crabs and other arthropods to accommodate their increasing size.