Any of numerous invertebrate animals having a segmented body, segmented appendages, and an external skeleton. Crustaceans, insects, and arachnids are all arthropods. Arthropods are the largest phylum in the animal kingdom.
Arthropod. (n.d.) The American Heritage® Dictionary of Student Science, Second Edition. (2014). Retrieved August 14 2016 fromhttp://www.thefreedictionary.com/arthropod
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