circulatory system has evolved from open to closed type in animal kingdom. which Phyllis can be called first to represent closed circulation
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According to the phylum order in the animal kingdom, the phylum Annelida is the first to have a closed circulatory system. Explanation: Till the phylum Nematoda, they have an “open circulatory system where the exchange takes place through gaseous diffusion and the blood is filled in the hemocoel.
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Explanation:
Platyhelminthes
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