character: Alex
topic: How Marine Animals Use Echolocation
grade: 10
subject: Physics
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character: Jane
topic: Understanding Echolocation in Dolphins
grade: 10
subject: Physics
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character: Mark
topic: Physics of Sound Waves in Water
grade: 10
subject: Physics
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character: Sarah
topic: Comparison of Echolocation in Bats and Marine Animals
grade: 10
subject: Physics
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