We are all familiar with crabs, which are very common in real life.In terms of category, they belong to crustaceans.From the appearance, the crab's shell is one of their important characteristics, their shell is very hard.Crabs shed their shells and can grow new ones.In some cases, we can directly observe the phenomenon of their shelling.In fact, crabs not only shed their shells, but also shed them not only once, but more than a dozen times in their lifetime.Shelling is very important for crabs, which shows that they are growing.
The above has been introduced, crabs will molt, and can molt more than a dozen times in a lifetime, molting for them is of great significance.This is because their shells themselves will not grow, but it does not mean that crabs will not grow, at this time crabs can only grow by shelling, so their every shelling is related to the process of growth.In fact, from big-eyed larvae, to young crabs, and then to adult crabs, the process of exuviation is more and inevitable.
When a crab is shelling, it will first absorb the calcium carbonate from the old shell and store it in the body fluid.Then, the crab will grow a very soft fold in the shell.After that, their old shells will slowly crack and fall off.The fold will open and slowly become a new shell, and then the crab will inject calcium carbonate stored in body fluids into the new shell, so that their new shell can harden.
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