Chordates are distinguished form non-chordates by the presence of:

Brain

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Dorsal tubular hollow nerve cord

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Ventral nerve cord

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Dorsal nerve cord

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Solution

The correct option is A Dorsal tubular hollow nerve cord
Chordates have central dorsal hollow nerve cord, which is absent in non-chordates. Chordates possess a notochord, a hollow dorsal nerve cord, pharyngeal slits, an endostyle, and a post-anal tail for at least some period of their life cycles.
So, the correct answer is option B.

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Based on the location of the dorsal nerve cord, chordates are subdivided into ___________________ & ____________________ .

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