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Which of the following characters is not seen in all chordates?

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Diaphragm

Coelom

Pharyngeal gill clefts

Dorsal nerve cord

answer is A.

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Detailed Solution

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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