What is the basis of classification of Protoc | vedclass

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(D) The phylum $Chordata$ is divided into two groups: $Acrania$ $(Protochordata)$ and $Craniata$ $(Euchordata)$.$Protochordates$ are primitive chordat

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Notochord

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(D) The phylum $Chordata$ is divided into two groups: $Acrania$ $(Protochordata)$ and $Craniata$ $(Euchordata)$.$Protochordates$ are primitive chordates that are classified based on the presence,absence,or extent of the $Notochord$ in their body.They are further divided into three subphyla: $Hemichordata$,$Urochordata$,and $Cephalochordata$,all of which are defined by the characteristics and distribution of the $Notochord$.

What is the basis of classification of $Protochordata$?

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