- A Mollusca
- B Echinodermata
- C Hemichordata
- D Annelida
Correct answer: B. Echinodermata
Explanation: The water vascular system, ending in tube feet, is a unique feature of Echinodermata, used for locomotion, capturing food, and respiration.
Concept context
Phylum-level classification of the animal kingdom from Porifera to Chordata, based on body symmetry, coelom, and segmentation. One of the most example-heavy chapters for NEET.