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a tough polysaccharide called chitin . the exoskeleton provides support and protection. periodically, an arthropod sheds this covering when it molts . arthropods also have a dorsal heart , a ventral nervous system , an open circulatory system , and a digestive system . arthropods play a major role in
human life as food, religious symbols, pollinators of flowers, and major links in food chains, as well as vectors of disease and agricultural pests. arthropods are adapted to almost all environments on earth. they are common throughout marine, freshwater, terrestrial, and even aerial environments, as...
https://www.newworldencyclopedia.org/entry/Arthropod