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B
Respiration
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C
Digestion
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D
Nutrition
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Solution
The correct option is C Excretion The contractile vacuoles are the structures which are present in the cells of the lower organisms. The vacuole plays an important role in excretion and osmoregulation. The wastes like the ammonia can be excreted through the vacuoles. The water and the other salts are also removed through this vacuoles in order to maintain the osmotic balance.