(A) $Balanoglossus$ belongs to the phylum Hemichordata. The characteristic larval stage of $Balanoglossus$ is called the $Tornaria$ larva. This larva

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(A) $Balanoglossus$ belongs to the phylum Hemichordata. The characteristic larval stage of $Balanoglossus$ is called the $Tornaria$ larva. This larva is free-swimming and ciliated,showing significant similarities to the bipinnaria larva of echinoderms,which suggests an evolutionary link between the two groups.