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why is arthropoda named so?
Joint-legged animals without backbones are called arthropods and are placed in the phylum Arthropoda.
Jointed legs give arthropods more mobility on dry land than mollusks and worms have.
    Arthropod body segments are more specialized than annelid segments, so arthropods enjoy a greater range of possible activities and behaviors than do segmented worms.

    The arthropods' exoskeleton reduces water loss from their bodies much better than the annelids' cuticle and the mollusks' thin skin.


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