Which of the following is a Cephalochordate?

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(A) The phylum $Chordata$ is divided into three subphyla: $Urochordata$ (Tunicata),$Cephalochordata$,and $Vertebrata$.$1$. $Amphioxus$ (also known as

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Amphioxus

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(A) The phylum $Chordata$ is divided into three subphyla: $Urochordata$ (Tunicata),$Cephalochordata$,and $Vertebrata$.$1$. $Amphioxus$ (also known as $Branchiostoma$ or lancelet) belongs to the subphylum $Cephalochordata$,where the notochord extends from head to tail region and persists throughout their life.$2$. $Balanoglossus$ belongs to the phylum $Hemichordata$.$3$. $Ascidia$ belongs to the subphylum $Urochordata$,where the notochord is present only in the larval tail.$4$. $Lamprey$ belongs to the class $Cyclostomata$ under the subphylum $Vertebrata$.Therefore,the correct option is $A$.

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