Which of the following statements are true fo | vedclass

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(A) Statement $(a)$ is incorrect because in $Urochordata$ (Tunicata),the notochord is present only in the larval tail.Statement $(b)$ is correct becau

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$(b)$ and $(c)$

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(A) Statement $(a)$ is incorrect because in $Urochordata$ (Tunicata),the notochord is present only in the larval tail.Statement $(b)$ is correct because in $Vertebrata$,the notochord is replaced by a cartilaginous or bony vertebral column in the adult.Statement $(c)$ is correct as a dorsal,hollow central nervous system is a fundamental characteristic of chordates.Statement $(d)$ is incorrect because $Chordata$ is divided into $3$ subphyla: $Urochordata$ (or $Tunicata$),$Cephalochordata$,and $Vertebrata$. $Hemichordata$ is a separate phylum.Therefore,statements $(b)$ and $(c)$ are true.

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