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B
Molluscs
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C
Echinoderms
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D
All the above
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Solution
The correct option is D Molluscs The visceral hump, or visceral mass, of gastropods is always contained within the shell; it generally holds the bulk of the digestive, reproductive, excretory, and respiratory systems. A significant part of the visceral hump consists of the mantle, or pallial cavity. All mollusks have a visceral mass containing internal organs, including the digestive tract, paired kidneys, reproductive organs and a mantle that surrounds but does not cover entirely the visceral mass and secretes a shell (if one is present).