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Which of the following features are common to Mollusca and Echinodermata?
(a) Mantle over the visceral hump
(b) Organ system level of organisation
(c) Water vascular system
(d) Unsegmented body
(e) Absence of excretory system

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(a), (c), (d) and (e)

(b), (c), (d) and (e)

(c), (d) and (e) only

(b) and (d) only

answer is D.

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Detailed Solution

Both molluscs and echinoderms are unsegmented animals and exhibit organ system level of organisation.

The mantle is unique to molluscs.

The presence of water vascular system and absence of excretory system are the features of Echinodermata.

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