sponges - pore-bearing animals, cnidarians - hollow-bodied animals, platyhelminthes - soft unsegmented flatworms, nematodes - unsegmented roundworms with tough outer cuticle, annelids - segmented worms, arthropods - joint-legged animals covered with exoskeleton, echinoderms - spiny exoskeleton covered animals, mollusks - soft-bodied animals with internal or external shell,

Invertebrates

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