Multiple choice

The animals of which phylum is exclusively free living and marine?

  1. Protochordata

  2. Echinodermata

  3. Mollusca

  4. Platyhelminthes
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Echinodermata is an entirely marine taxon, occurring throughout the world’s oceans and includes sea stars, brittle stars, sea urchins, sand dollars, sea cucumbers and sea lilies.

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