Which of the following is not a characteristic feature of all chordates

Which of the following is not a characteristic feature of all chordates

Options

(a) the presence of coelom
(b) pharyngeal gill clefts in the early embryonic stages
(c) a diaphragm that sperates thorax from abdomen
(d) Dorsal nerve cord

Correct Answer:

a diaphragm that sperates thorax from abdomen

Explanation:

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