Multiple choice

The heart is simple, tubular and ventral. This condition is seen in:

  1. cyclostomata

  2. cephalochordate

  3. vertebrata

  4. urochordata
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D Correct answer
Explanation

Urochordates (tunicates) possess a simple, tubular, ventral heart that can reverse direction. This primitive heart structure contrasts with the more complex chambered hearts found in vertebrates (Vertebrata) and other chordate groups.

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