1. Chordata
  2. Arthropoda
  3. Echinoderm
  4. Nematoda
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Option 3 : Echinoderm

  • Sea Cucumber belongs to Echinoderm Phylum.
  • Echinoderms are also the largest phylum that has no freshwater or terrestrial (land-based) representatives.
  • Echinoderm includes animals like sea stars, sea urchins, sand dollars, and sea cucumbers.
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