A) notochord is absent.
B) pharyngeal gill-slits are lacking.
C) dorsal nerve cord is absent.
D) eart is lacking.
Correct Answer: A
Solution :
[a] Hemichordates have now been placed with the non-chordates because true notochord is absent in them but a buccal diverticulum is present in pre-oral region which is often called stomochord.
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