(B) The $U$-shaped digestive tract is a characteristic feature of the phylum $Hemichordata$. In these organisms,the mouth and anus are located close t

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(B) The $U$-shaped digestive tract is a characteristic feature of the phylum $Hemichordata$. In these organisms,the mouth and anus are located close to each other,resulting in a $U$-shaped gut. For example,in $Balanoglossus$,the alimentary canal is $U$-shaped.