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B
Echinodermata
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C
Arthropoda
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D
Cnidaria
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Solution
The correct option is A Mollusca
Option (A) Mollusca
Veligen, larva typical of certain mollusks such as marine snails and bivalves and a few fresh water bivalves. The veliger develops from the trochophore larva has large, ciliated lobes. The nollusk begins to develop a foot and shell during the veliger stage.