In which one of the following options, a category of animals is correctly described with no single exception in it?

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Annelida - Triploblastic metamerically segmented coelomate animals with lateral appendages called parapodia

Arthropoda - Body is covered by chitinous exoskeleton. Three pairs of jointed legs and two pairs of wings are present in the thorax

Mollusca - Bilaterally symmetrical, triploblastic and coelomate animals with open blood vascular system

Echinodermata - Marine animals with a water vascular system which helps in locomotion, food capture and respiration

answer is D.

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Detailed Solution

All echinoderms are marine, with a water vascular system which helps in locomotion, food capture and respiration. Parapodia are present only in polychaetes (e.g. Nereis); not in all annelids. Presence of three pairs of legs is a characteristic feature of insects (not all arthropods). Among molluscs, cephalopods have a closed blood vascular system.

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