Arthropods are part of the largest and most diverse phylum in the animal kingdom. The phylum which I am speaking of is called Arthropoda, which is Latin for "jointed feet." Arthropods are arranged of more than one million invertebrate species within four subphyla. The four subphyla consist of five classes of Uniramia including insects, three classes of Chelicerata including horseshoe crabs and arachnids, Trilobita (which are extinct), and Crustacea. When you break down an arthropod you will find that every single one of them are bilaterally symmetrical and have a segmented body that is protected by an exterior shell which contains chitin. Chitin serves two purposes fo the arthropod. It first serves as armor to protect the arthropod from predators, weather, and whatever else it may encounter. The second purpose it serves is to be a surface for the muscles to attach to. Each body segment the arthropod has bears a pair of jointed arms or legs. Insects are arthropods with six legs and......
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