Which of the following statements is true?

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(B) The correct statement is that $All$ $vertebrates$ $are$ $chordates$. In the phylum $Chordata$, the presence of a notochord is a defining character

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All vertebrates are chordates

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(B) The correct statement is that $All$ $vertebrates$ $are$ $chordates$. In the phylum $Chordata$, the presence of a notochord is a defining characteristic. Vertebrates are a subphylum of $Chordata$ where the notochord is replaced by a vertebral column in the adult stage. Therefore, all vertebrates possess a notochord at some stage in their life cycle, making them chordates, but not all chordates (such as $Urochordata$ and $Cephalochordata$) are vertebrates.

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