Discussion
Which one of the following groups includes at least one animal that is NOT an arthropod?
Answer: C
The group with a non-arthropod is Group 3: millipedes, horseshoe crabs, sponges, earthworms.
Arthropods have jointed legs, a segmented body and a chitinous exoskeleton. Millipedes (myriapods) and horseshoe crabs (chelicerates) qualify, but sponges belong to the phylum Porifera and earthworms to Annelida. Earthworms are segmented but have no exoskeleton or jointed limbs.
Group 1 holds only arthropods: crustaceans, scorpions and mites (arachnids), and insects. Group 2 also does: trilobites are an extinct class of arthropods, and horseshoe crabs and centipedes are living ones. Group 4 consists of insects.
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