1. Which of these groups of animals is invertebrate?
A. nematodes, annelids, and platyhelminthes
B. crustaceans, amphibians, and mollusks
c. mollusks, insects, and mammals
D. reptiles, fishes, and birds
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
C. arachnids
B. crustaceans
D. nematodes​