Closed circulatory system is present in animals belonging to phylum:

Correct answer: A. Annelida

  • A. Annelida
  • B. Mollusca
  • C. Nematoda
  • D. Arthropoda

Explanation

The correct answer is Annelida. Animals in this phylum, such as earthworms, possess a closed circulatory system where blood circulates within vessels, allowing for more efficient transport of nutrients and gases.

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