All vertebrates possess ......... .

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(B) All vertebrates belong to the phylum $Chordata$. Key characteristics of chordates include the presence of a notochord,a dorsal hollow nerve cord,a

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Dorsal,hollow,central nervous system

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(B) All vertebrates belong to the phylum $Chordata$. Key characteristics of chordates include the presence of a notochord,a dorsal hollow nerve cord,and pharyngeal gill slits at some stage of their life cycle. While not all vertebrates have a renal portal system or a four-chambered heart (e.g.,fish have a two-chambered heart),the presence of a dorsal,hollow,central nervous system is a fundamental diagnostic feature of all vertebrates.

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