character: Dolphin Dan
topic: How Dolphins Use Echolocation
grade: 3
subject: Science
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character: Ocean Explorer
topic: Underwater Communication in Marine Animals
grade: 3
subject: Science
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character: Captain Coral
topic: The Wonders of Marine Life
grade: 3
subject: Science
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character: Marine Biologist Bob
topic: An Introduction to Dolphin Behavior
grade: 3
subject: Science
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