Crustaceans like crabs shed their exoskeleton like insects and arachnids. Once they leave their protective shell, they are vulnerable because their new skin is soft. After an hour or so (depending on...
With females, it is an average of 3-3.5 inches per year. With males, it is an average of 4 inches per year. You can increase these numbers by exercise, proteins [Found in meats, dairy, nuts, e.c.t....