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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