A characteristic feature of Echinoderm is:
Correct answer: B. Water vascular system
- A. Canal system
- B. Water vascular system
- C. Tracheal system
- D. Blood vascular system
- E. None of these
Explanation
The characteristic of adult echinoderms is the possession of a water vascular system. There is no true heart and blood and no tracheal or canal system.
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About Kingdom Animalia
Animals are multicellular, heterotrophic eukaryotes whose cells lack cell walls and chloroplasts, with specialised tissues in most groups. Coverage includes body symmetry, tissue layers, coelom, segmentation and levels of organisation, plus major phyla such as Porifera, Cnidaria, Platyhelminthes, Annelida, Arthropoda, Mollusca and Chordata.
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