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Porifera or sea sponges have perforated interior wall; coelenterates (Ctenophores and Cnidaria) have a hollow body cavity; nematodes have a round cross section and keratin cuticle; annelids are multiple circular segmented worms; molluscs have a muscular foot and mantle and rounded shell; arthropods are characterized by chitinous exoskeletons and jointed appendages.

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11y ago

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