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S.No.

 Chordates

 Non-chordates

 1.

Notochord present.

Notochord absent.

 2.

Central nervous system is dorsal, hollow and single.

Central nervous system is ventral, solid and double.

 3.

Pharynx perforated by gill slits.

Gill slits are absent.

 4.

Heart is ventral.

Heart is dorsal (if present).

 5.

A post-anal part (tail) is present.

Post-anal tail is absent.

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