The animals belonging to second largest phylum do not possess

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gills

bilateral symmetry

segmentation

calcareous shell

answer is C.

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Detailed Solution

Molluscs is the second largest animal phylum. Molluscs are terrestrial or aquatic (marine or fresh water) having an organ-system level of organisation. They are bilaterally symmetrical, triploblastic and coelomate animals. Body is covered by a calcareous shell and is unsegmented with a distinct head, muscular foot and visceral hump.

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