CLASSIFICATION
NINE COMMON ANIMAL PHYLA
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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bilateral symmetry
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water vascular system
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radial symmetry
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heterotrophic
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Detailed explanation-1: -Echinoderms possess a unique ambulacral or water vascular system, consisting of a central ring canal and radial canals that extend along each arm.
Detailed explanation-2: -Examples of echinoderms include sea stars, sea urchins, sea cucumbers, brittle stars, and feather stars (Fig. 3.83). Although they may appear very different, echinoderms all have two major defining characteristics that set them apart from all other animals: a water vascular system and five-sided radial symmetry.
Detailed explanation-3: -Among the choices in the problem, the unique characteristic of echinoderms is their water vascular system.
Detailed explanation-4: -Water vascular system is a unique characteristic of echinoderms. It helps in locomotion, the capture of food and respiration.