(C) $Balanoglossus$ is a classic example of the phylum $Hemichordata$.It was previously considered a sub-phylum under $Chordata$ but is now placed as

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(C) $Balanoglossus$ is a classic example of the phylum $Hemichordata$.It was previously considered a sub-phylum under $Chordata$ but is now placed as a separate phylum due to the presence of a rudimentary structure in the collar region called the $stomochord$,which is not a true $notochord$.