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character: Calcium Carbonate
topic: Role in Shell Formation
grade: 9
subject: Biology
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character: Marine Organisms
topic: Calcification Process
grade: 9
subject: Biology
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character: Oysters
topic: Shell Composition
grade: 9
subject: Biology
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character: Coral Reefs
topic: Calcium Carbonate Structures
grade: 9
subject: Biology
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