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The chief characteristic of arthropods would be their exoskeleton, made mostly of a tough protein called chitin; this gives them a segmented appearance and necessitates jointed appendages (hence the phylum's name, Arthropoda, which comes from Greek for jointed foot or jointed leg).

Note that the term 'anthropod' should not be confused with 'arthropod' - anthropod is not a phylum but is a general term meaning human or humanoid.

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12y ago

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