Classification of Animals
Question
Which of the following characteristic features holds true for all the animals of the corresponding group?
Moderate
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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