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list the # of body sections, legs (pairs), antennae of crustaceans, arachnids, and insects
Crustaceans 2-3 body sections 5+ pairs of legs and 2 pairs of antennae
Arachnids 2 body sections 4 pairs of legs and 0 antennae
Insects 3 body sections 3 pairs of legs and 1 pair of antennae