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In which of the following animals is the blood circulated through a series of vessels of varying diameters (arteries, veins and capillaries)?

Options

  1. ASaccoglossus
  2. BNereis
  3. CBombyx
  4. DPleurobrachia

Correct answer

B. Nereis

Step-by-step solution

The statement in the question is the exact definition of a closed circulatory system. Nereis belongs to the phylum Annelida, which possesses a closed circulatory system. Saccoglossus (Hemichordata) and Bombyx (Arthropoda) have an open circulatory system. Pleurobrachia (Ctenophora) lacks a circulatory system entirely. Answer: Nereis

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