There skeleton is made up of calcareous plates or spicules of phylum
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phylum echinodermata
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As a whole, poriferans have diverseskeletal elements including calcareouslaminae, organic filaments, and siliceous and calcareous spicules. ... Some spicules are formed of the mineralized substances calcium carbonate and silica, while others aremade of an organic substance called spongin.
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