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Question
which of the three classes of phylum porifera has spicules made of calcium carbonate? class calcarea class diptera
Brief Explanations
Porifera phylum has three classes: Calcarea, Hexactinellida, and Demospongiae. Class Calcarea has spicules made of calcium carbonate. Class Diptera is not part of Porifera (it's an insect class in Arthropoda).
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Class Calcarea