Crabs moult through a process called ecdysis, which allows them to grow since their hard exoskeleton (shell) doesn’t stretch. Here's how it works step-by-step: Pre-molt stage: The crab absorbs calcium from its old shell and stores it in its body. It also starts forming a soft new shell underneath the old one. During this time, the crab may stop eating and hide to prepare for moulting. Shedding the old shell: The crab takes in water to swell its body, which causes the old shell to crack—usually a
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Animals that undergo ecdysis, or molting, include nematodes and arthropods. Why do these animals molt? shedding the exoskeleton allows the animal to move faster to escape predators the exoskeleton prevents them from obtaining oxygen their outer covering is made of a non-living substance shedding the exoskeleton makes the animal smaller, which makes it easier for the animal to hide from predators in crevices
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