Q39 of 525 Page 222

Echinoderms have

The most distinctive feature of echinoderms is the presence of water vascular system which helps in locomotion, capture and transport of food and respiration.

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37

In the Pila, the gastropod mollusk, the organ of the locomotion is

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Starfish belongs to phylum

 40

Phylum Chordata is named after the occurrence of

 41

In higher chordates, notochord is transformed into