bio voc 28
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| external skeleton; tough external covering that protects and supports the body of many invertebrates | exoskeleton
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| complex carbohydrate that makes up the cell wals of fungi; also found in the external skeletons of arthropods | chitin
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| structure, such as a leg or antenna; that extends from the body wall | appendage
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| one of many branching, air filled tubes that extend throughout the bodies of many terrestrial arthropods | tracheal tube
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| small opening located along the side of the body through which air enters and leaves the body of many terrestrial arthropods | spiracle
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| organ that has layers of respiratory tissue stacked like the pages of a book; used by some terrestrial arthropods for the exchange of gases | book lungs
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| saclike organ in most terrestrial arthropods that extracts wastes from the blood, adding them to feces that move through the gut | malpighian tubule
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| process in which an arthropod sheds its exoskeleton and manufactures a larger one to take its place | molting
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| region of a crustacean formed by the fusion of the head with the thorax | cephalothorax
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| body part of a crustacean that lies just behind the head and houses most of the internal organs | thorax
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| posterior part of an arthropod's body | abdomen
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| in crustaceans, the part of the exoskeleton that covers the cephalothorax; in turtles and tortoises, the dorsal part of the shell | carapace
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| mouth part adapted for biting and grinding food | mandible
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| one of the first pair of legs of decapods | cheliped
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| flipperlike appendages used by decapods for swimming | swimmeret
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| pair of mouthparts in chelicerates that contain fangs and are used to stab and paralyze prey | chelicera
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| pair of mouthparts in chelicerates that are usually modified to grab prey | pedipalp
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| organ in spiders that contains silk glands | spinneret
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| type of insect development characterized by a similar appearance through out all stages of the life cycle | incomplete metamorphosis
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| immature form that lacks functional sex organs and other adult structures | nymph
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| type of insect development in which the larvae look and act nothing like their parents and also feed in completely different ways | complete metamorphosis
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| stage of metamorphosis in which an insect changes from a larva into an adult | pupa
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| specific chemical messenger that affects the behavior or developement of other individuals of the same species | pheromone
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| group of closely related animals of the same species that work together for the benefit of the group | society
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| group of individual insects specialized to perform particular tasks or roles | castes
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| structural support located inside the body of an animal | endoskeleton
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| system of internal tubes in echinoderms that carries out essential functions such as feeding, respiration, circulation, and movement | water vascular system
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| sievelike structure through which the water vascular system of echinoderm opens to the outside | madreporite
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| suction-cuplike structure attached to radial canals of echinoderms; used to walk and to open shells | tubefoot
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