What must a crab do to its skeleton when need grow?

Crabs don't have bones like we do. Instead, they have a hard, outer shell called an exoskeleton. To grow, they need to shed their old exoskeleton in a process called molting. Here's what happens:

1. Softening: The crab's body secretes a special fluid that softens the old exoskeleton.

2. Splitting: The crab splits the exoskeleton, usually along the back.

3. Emerging: The crab slowly crawls out of its old shell, leaving it behind.

4. Expansion: The crab is now soft and vulnerable. It quickly absorbs water, expanding its body and pushing against its new, soft exoskeleton.

5. Hardening: Over a few days, the new exoskeleton hardens, becoming the crab's new protective shell.

This process is repeated throughout the crab's life as it continues to grow.