Answer:
Echinodermata:phyla contains only marine animals.
Step-by-step explanation:
Echinoderms in the phyla which contains only marine animals.
- At the larval stages, they have bilateral symmetry whereas adults of the Echinoderm have radial symmetry.
- Examples of Echinoderms: starfish, sea cucumbers,sea lilies and sea urchins.
- They are present at Ocean depth, not present in freshwater.
- In the echinoderms have unique water vascular system as a circulatory system, which helps in the locomotion, nutrient circulation, gaseous exchange, and waste removal.