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character: Sea Urchin
topic: Echinoderm Life Cycle Stages
grade: 9
subject: Biology
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character: Echinodermata
topic: Development and Reproduction
grade: 9
subject: Biology
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character: Larval Stages
topic: Planktonic Development in Echinoderms
grade: 9
subject: Biology
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character: Adult Sea Urchin
topic: Reproductive Strategies and Habitat
grade: 9
subject: Biology
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