eksoskeleton

An exoskeleton is an external covering or shell that supports and protects an animal's body. This type of skeleton is found in many invertebrates, such as insects, crustaceans, and arachnids. Exoskeletons are typically made of a tough, flexible material called chitin. Unlike the internal skeletons of vertebrates, exoskeletons do not grow with the animal. Instead, the animal must periodically shed its old exoskeleton and grow a new, larger one in a process called molting or ecdysis. This process leaves the animal vulnerable until its new exoskeleton hardens. The exoskeleton provides protection from predators and environmental hazards, serves as an attachment point for muscles, and helps prevent water loss. Different types of animals have exoskeletons adapted to their specific environments and lifestyles. For example, the hard shell of a crab offers robust defense, while the chitinous wings of an insect are lightweight for flight. The rigidity of an exoskeleton limits an animal's size to some extent due to the physical constraints of molting and the weight of the structure.