(B) The larval form of $Hemichordata$ (specifically in the class $Enteropneusta$,such as $Balanoglossus$) is known as the $Tornaria$ larva. This larva

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(B) The larval form of $Hemichordata$ (specifically in the class $Enteropneusta$,such as $Balanoglossus$) is known as the $Tornaria$ larva. This larva is planktonic and bears a striking resemblance to the $Bipinnaria$ larva of $Echinodermata$,which suggests an evolutionary link between the two phyla.