Which of the following character is not found in all the chordates?

Diaphragm

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Coelom

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Pharyngeal gill slits

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Dorsal nerve cord

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Solution

The correct option is B Diaphragm
The characteristic features of the phylum Chordata are:
1. A dorsal, hollow nerve cord.
2. A notochord at some time during development.
3. Pharyngeal gill slits at some time during development.
4. A muscular post-anal tail at some during development.
The Diaphragm is a dome-shaped muscular partition that separates the thorax from the abdomen. Its presence is a characteristic feature of only mammals.
So, the correct option is 'Diaphragm'.

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