Select the incorrect option for vertebrates:

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(A) The correct answer is $A$. In the phylum $Chordata$,all vertebrates are chordates because they possess a notochord during the embryonic stage,whic

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All chordates are vertebrates,but all vertebrates are not chordates.

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(A) The correct answer is $A$. In the phylum $Chordata$,all vertebrates are chordates because they possess a notochord during the embryonic stage,which is replaced by a vertebral column in adults. However,not all chordates are vertebrates (e.g.,Urochordates and Cephalochordates lack a vertebral column). Therefore,the statement 'All chordates are vertebrates,but all vertebrates are not chordates' is scientifically incorrect. Vertebrates are characterized by a ventral muscular heart,kidneys for excretion/osmoregulation,and paired appendages (fins or limbs).

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