Multiple choice

Which of the following are echinoderms?

  1. Sea star

  2. Sea urchon

  3. Sand dollar

  4. None of these

  5. All of these
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Sea stars, sea urchins (misspelled as 'urchon'), and sand dollars are all echinoderms. They share characteristics including radial symmetry (usually five-part), a water vascular system, and tube feet. 'All of these' is the correct answer as all three listed organisms belong to the phylum Echinodermata.

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