Their skeletons are built on the framework of a secreted glycoprotein matrix, most commonly cemented together with secreted calcium carbonate to form a shell, but sometimes imbedded with gathered foreign mineral particles.
Source: wiktionary
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Their skeletons are built on the framework of a secreted glycoprotein matrix, most commonly cemented together with secreted calcium carbonate to form a shell, but sometimes imbedded with gathered foreign mineral particles.
Source: wiktionary