Which one of the following is found in chordates but not in non-chordates?

Gills

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Spiracles

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Notochord

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Chitinous exoskeleton

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Solution

The correct option is D Notochord
Animals belonging to the phylum Chordata are characterized by the presence of a notochord, a dorsal hollow nerve cord, a post-anal tail, and paired pharyngeal gill slits. Non-chordates do not possess a notochord.
Thus, the correct answer is option C.

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