Whose body wall is made of calcium carbonate?

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(D) The body wall of organisms belonging to the phylum $Echinodermata$ is characterized by the presence of an endoskeleton composed of calcareous ossi

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Sea urchin

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(D) The body wall of organisms belonging to the phylum $Echinodermata$ is characterized by the presence of an endoskeleton composed of calcareous ossicles (calcium carbonate plates).Among the given options,the sea urchin $(Echinus)$ belongs to the phylum $Echinodermata$.Scorpion,Prawn,and Cockroach belong to the phylum $Arthropoda$,which possess an exoskeleton made of chitin.

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