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Which of the following character is absent in all chordates?

A. Diaphragm

B. Coelom

C. Pharyngeal gill clefts

D. Dorsal nerve cord

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Correct Answer : A.


Diaphragm is a membrane that separates thoracic cavity from abdominal cavity. It is present only in mammals. All other chordates do not have diaphragm as their body cavity is not divided into thoracic and abdominal cavities.

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