Multiple choice

Which of the following is one of the fundamental characters of chordates?

  1. Presence of limbs

  2. Presence of heart

  3. Presence of nervous system

  4. Presence of haemoglobin
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C Correct answer
Explanation

Chordates are defined by five fundamental characteristics: notochord, dorsal hollow nerve cord, pharyngeal slits, post-anal tail, and endostyle/thyroid gland. The presence of a nervous system (specifically the dorsal hollow nerve cord) is one of these defining features. Limbs, heart, and haemoglobin are not unique to chordates.

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