trees system has your late from open to close type in animal kingdom which Phylum can be call 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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