2. Which group of invertebrates is divided into segments with a ringed appearance? *
a. Sponges
b. Echinoderms
c. Cnidarians
d. Annelids
3. To what subgroup of arthropods do invertebrates with four pairs of legs belong?
a. echinoderms
b. crustaceans
c. arachnids
d. nematodes
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