All vertebrates are chordates but all chordat | vedclass

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Question

(B) The correct answer is option $B$ because the members of subphylum $Vertebrata$ possess a notochord during the embryonic period.Since all vertebrat

Vedclass · Accepted Answer

Notochord is replaced by vertebral column in adult of some chordates.

Vedclass · Answer

(B) The correct answer is option $B$ because the members of subphylum $Vertebrata$ possess a notochord during the embryonic period.Since all vertebrates possess a notochord at some stage of their life,they are classified as chordates.However,in adult vertebrates,the notochord is replaced by a cartilaginous or bony vertebral column.In protochordates (urochordates and cephalochordates),a vertebral column is never formed. In urochordates,the notochord is present only in the larval tail,while in cephalochordates,it extends from head to tail region and persists throughout their life.Therefore,because not all chordates develop a vertebral column,all chordates are not vertebrates.

All vertebrates are chordates but all chordates are not vertebrates,why?

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