The most important character of chordata is:

Dorsal hollow nervous system

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Vertebral column

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Kidneys

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None of the above

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Solution

The correct option is B Dorsal hollow nervous system
Chordates are characterized by the presence of a notochord, pharynx perforated by gill slits, post-anal tail and central nervous system that is dorsal, hollow and single. Only the subphyla Vertebrata possess the vertebral column and not all the chordates (Eg- Chondrichthyes, Osteichthyes) possess the kidneys.
So, the correct answer is option A.

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