"What characteristics are responsible for the branching off of the arthropods from earlier animals?", "eucoelomates with a hard segmented body" "What characteristics do all arthropods have in common?", "hard exoskeleton called a cuticle" "What level of organization do these organisms demonstrate?", "organ system level" "How many tissue layers do these organisms have?", "triploblastic" "What are the 5 recognized subphyla in this phylum?", "Trilobita<br /> Checlicerata<br /> Crustacea<br /> Myriapoda<br /> Hexapoda" "When do they show up in the evolutionary history?", "Precambrian" "Where are they found?", "worlwide" "Type of Excretory System", "excretory glands" "Type of Circulatory System", "Open system with dorsal contractile heart" "Type of Respiratory system", "body surfaces" "Type of Nervous System", "dorsal ganglia"
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