The exoskeleton is the outermost skeleton, and is found in many invertebrates; They envelop and protect soft tissues and organs. Some types of exoskeletons undergo periodic molting as these species develop, as is the case in arthropods including insects and crustaceans. The exoskeleton is made of various materials including chitin (in arthropods), calcium compounds (in stony corals and molluscs) and silicate (for diatoms and radiolarians.). The insect's exoskeleton is not only a protective layer but also serves as a surface for attaching muscles, as a waterproof and dry protection, and as a sensory for animals to interact with. environment. The mollusk shell also performs all the same functions, except in many cases it does not contain the senses. Skeleton Social Distancing shirt
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