Which of the following is NOT a subphylum of | vedclass

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(A) Phylum $Chordata$ is divided into three subphyla: $Urochordata$ (or $Tunicata$),$Cephalochordata$,and $Vertebrata$. $Hemichordata$ was previously

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Hemichordata

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(A) Phylum $Chordata$ is divided into three subphyla: $Urochordata$ (or $Tunicata$),$Cephalochordata$,and $Vertebrata$. $Hemichordata$ was previously considered a subphylum of $Chordata$ but is now classified as a separate phylum because it lacks a true notochord (it has a stomochord). Therefore,$Hemichordata$ is not a subphylum of $Chordata$.

Which of the following is $NOT$ a subphylum of Phylum $Chordata$?

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