What are the integuments of the body, arachnids and crustaceans? What are the functions of the integuments?

What are the integuments of the body, arachnids and crustaceans? What are the functions of the integuments? What are the number of walking legs in these types (bodies, arachnids and crustaceans?)

arthropods have an exoskeleton (cover) consisting of chitin (carbohydrate), which protects against mechanical damage, thermal (from drying out under the influence of the sun)
arachnids have four pairs of walking legs
insects – three
crustaceans – five



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