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Which of the following characteristic features holds true for all the animals of the corresponding group?

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Hooks and suckers - Platyhelminthes

Metamerism - Echinodermata

Jointed appendages - Annelida

Mantle - Mollusca

answer is D.

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Detailed Solution

In molluscs, soft and spongy layer of skin forms a mantle over the visceral hump. In Platyhelminthes, hooks and suckers are present only in parasitic forms. Echinoderms are unsegmented. Jointed appendages are found in arthropods (not annelids).

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