(B) The phylum $Chordata$ is divided into three subphyla: $Urochordata$ (or $Tunicata$),$Cephalochordata$,and $Vertebrata$. $Invertebrata$ is a broad,

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(B) The phylum $Chordata$ is divided into three subphyla: $Urochordata$ (or $Tunicata$),$Cephalochordata$,and $Vertebrata$. $Invertebrata$ is a broad,informal group used to describe animals without a backbone,which includes many phyla,but it is not a subphylum of $Chordata$.