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15 August, 07:35

Which of the following is an unsegmented animal with a free-swimming larval stage? A. flatworm. B. annelid. C. mollusk. D. echinoderm

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  1. 15 August, 09:08
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    The answer is C. mollusk.

    Among the all choices, echinoderm and annelid are segmented animals. So, it leaves flatworm and mollusk as possible answer. However, flatworms have no a free-swimming larval stage. Mollusk is an unsegmented animal with a free-swimming larval stage we were looking for. After eggs production, from them trochophore larvae can emerge. This trochophore larvae is planctonic which means it is a free-swimming.
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