Multiple choice

Which of the following is an Echinoderm?

  1. Sea cucumber

  2. Jelly fish

  3. Octopus

  4. Annelid

  5. Millipede
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A Correct answer
Explanation

Sea cucumbers are echinoderms, belonging to the same phylum as sea stars and sea urchins. They share the characteristic radial symmetry (often appearing bilateral due to adaptation) and water vascular system of echinoderms. Jelly fish are cnidarians, octopuses are molluscs, annelids are segmented worms, and millipedes are arthropods.

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