First slide
Classification of Animals
Question

Which of the following character is unique to Tusk-shell?

Easy
Solution

In Dentalium (Mollusca),  body is covered by a calcareous shell and is unsegmented with a distinct head, muscular foot and visceral hump.

Water vascular system and radial symmetry are characters of echinoderms.

Choanocytes are found in sponges.

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