In molluscs, the gills have respiratory and excretory functions. They are present

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inside the visceral hump

outside the visceral hump and below the mantle

in foot

between mantle and shell

answer is B.

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Detailed Solution

A soft and spongy layer of skin forms a mantle over the visceral hump. The space between the hump and the mantle is called the mantle cavity in which feather like gills are present. The gills are respiratory and excretory in function.

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