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Unit 4 Lab 15

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Question
Answer
arthropod   body plan consists of a segmented body, hard exoskeleton, and jointed appendages  
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open circulatory system   in which hemolymph is circulated into the spaces surrounding the tissues and organs  
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chelicerata   sea spiders, horseshoe crabs, scorpions, ticks, mites, and spiders  
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myriapoda   centipedes and millipedes  
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hexapoda   insects and relatives  
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crustacea   crabs, lobsters, shrimps, barnacles, and many others  
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subphylum Chelicerata, are named for clawlike feeding appendages called   chelicerae  
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eurypterids   earliest cheliceriforms (water scorpions)  
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arachnids   most modern cheliceriforms; which include spiders, scorpions, ticks, and mites  
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incomplete metamorphosis   the young, called nymphs, resemble adults but are smaller and go through a series of molts until they reach full size  
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complete metamorphosis   have larval stages known by such names as maggot, grub, or caterpillar  
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isopods   terrestrial, freshwater, and marine species  
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decapods   relatively large crustaceans and include lobsters, crabs, crayfish, and shrimp  
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planktonic crustaceans   include many species of copepods, which are among the most numerous of all animals  
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