Which of the following characters is not seen in all chordates?
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a
Diaphragm
b
Coelom
c
Pharyngeal gill clefts
d
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.