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Practice question

Question

Why do echinoderms exhibit bilateral symmetry in their larval stage but radial symmetry as adults?

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Explanation

Larval Stage: Bilateral symmetry enables free-swimming larvae to balance and move efficiently in open water. Adult Stage: Adult echinoderms live on the seafloor (benthic zone). Pentaradial symmetry allows them to feed and detect surroundings equally from all directions.

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