The circulatory system evolved from open to closed type in Animal Kingdom. Which phylum can be called first to represents closed circulation
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Answer:
Phylum Annelida can be called first to represent Closed circulation.
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Annelida is the phylum which is the first phylum to represent the closed circulatory system.
In closed system of circulation, the blood flows through vessels like veins, arteries, etc
ADDITIONAL INFORMATION -
Leech, Earthworm, Nereis belongs to this phylum.
The members of this phylum excretes through special structures called Nephridia.
Parapodia are the appendages which helps them in locomotion.
They reproduce by sexual method.
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