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B
Parenchymula
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C
Cysticercus
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D
Glochidium
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Solution
The correct option is B Parenchymula Parenchymula is a sponge larva, which appears as a solid ball with exterior flagellated cells. It is a free-swimming larval stage. It is found in some Calcarea and many Demospongiae. Hence, option B is correct.