Which of the following is a chordate feature, | vedclass

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(D) The $Notochord$ is a defining characteristic found exclusively in chordates and is absent in non-chordates.All chordates possess a mesodermally de

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Notochord

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(D) The $Notochord$ is a defining characteristic found exclusively in chordates and is absent in non-chordates.All chordates possess a mesodermally derived $Notochord$ during their embryonic life,which serves as the main axial support for the body.In many chordates,the $Notochord$ is replaced by a vertebral column in the adult stage,and these organisms are classified as vertebrates.

Which of the following is a chordate feature,not shared by the non-chordates?

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Label the parts $P$,$Q$,$R$,and $S$ in the given diagram of a chordate:

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