character: Coral Reef Ecosystem
topic: Marine Invertebrates and Their Ecological Roles
grade: 10
subject: Biology
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character: Sea Urchins
topic: Herbivory and the Balance of Marine Ecosystems
grade: 10
subject: Biology
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character: Jellyfish
topic: Predatory Relationships in Marine Food Chains
grade: 10
subject: Biology
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character: Bivalves (e.g., clams, oysters)
topic: Filter Feeding and Water Quality in Marine Environments
grade: 10
subject: Biology
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