What is exctoskeleton?

Answer 1

An exoskeleton is a rigid external covering that provides support and protection to certain animals, primarily arthropods like insects, crustaceans, and some mollusks. Unlike an internal skeleton, an exoskeleton is made of materials such as chitin or calcium carbonate and must be periodically shed and renewed as the organism grows. It serves various functions, including defense against predators, structural support, and aiding in locomotion. Exoskeletons also help prevent water loss in terrestrial environments.