Two functions of tube feet are: (select one) A) swimming and walkingB) locomotion and food ingestionC) taking in water and walkingD) locomotion and opening bivalve prey

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Tube feet are part of the water vascular system of Echinoderms. These are essential for locomotion. The tube feet are located in the ambulacral groove of each ray and help the animal to move on the sea floor. However, when they wrap the rays around a bivalve such as a clam, oyster or mussel, they can exert continuous pressure on the upper and lower shells until eventually, the muscles inside the bivalves become fatigued and the shells open. This gives the echinoderm the ability to evert their stomach around the prey and pull it back into the mouth. Therefore, the correct answer is choice D.

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