Which of the following is a characteristic feature of chordates?

Hollow bones

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Presence of notochord

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Presence of fins

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Three-chambered heart

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Solution

The correct option is D Presence of notochord
All chordates are characterized by three primary features - the presence of a notochord, a dorsal hollow nerve cord, and paired pharyngeal gill slits.
Some chordates, but not all chordates, showed the other three characteristics given in the options.
Like hollow bones are present in birds only, fins are present in members of the superclass Pisces and three-chambered heart is present in members of class Amphibia, Reptilia only.

So, the correct answer is option B.

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