they shed thier exoskeleton for a new one
As the arthropod grows up, the exoskeleton sheds in order for the arthropod to grow inside of it.
Because of the hardness and inflexibility of the arthropod exoskeleton, they are not suited to expansion and need to be shed or discarded entirely to allow the arthropod to grow. This action is usually called moulting.
they get a boner
It breaks open and a new one grows.
Arthropods molt (moult) in a process called ecdysis. It is necessary for growth because of the inflexibility of the exoskeleton. The old shell remnants are called exuviae. Note that the term 'anthropod' should not be confused with 'arthropod'; anthropods are humans or humanoids and do not moult in the canonic sense.
Because of the composition of the exoskeleton. It must of necessity be tough to serve its function. Since it is inflexible, the organism has to periodically shed it (moult) in order to grow; a process called ecdysis.
No, arthropods do not have cell walls. Arthropods have a hard exoskeleton made of chitin, which provides support and protection for their bodies. The exoskeleton is molted and replaced as the arthropod grows.
Jointed appendages, appendages are tiny structures (leg or antenna) that grows out side of the body.
they normally shed their shells, like crabs or snakes. (except snakes shed their skin).
a snails has an exoskeleton known as a shell. The shell grows with the snail as it ages.
When it grows to big for its exoskeleton, like a hermit crab.
An animal (insect) with an exoskeleton still grows under its exoskeleton like any other animal (insect). The exoskeleton is like a suit of armor, when the animal (insect) grows to big to fit inside its exoskeleton it sheds it, and a newer exoskeleton will grow to fit the animal (insect).