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All chordates possess a notochord at some stage, which provides structural support.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Phylum Hemichordata and Chordata - Protochordata
All chordates possess a dorsal hollow nerve cord at some stage in their development.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Phylum Mollusca and Echinodermata
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