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Q.
Which of the following groups of animals have closed circulatory system?
Animal Kingdom
Solution:
In closed circulatory system, blood circulates through a series of blood vessels of varying diameter i.e. arteries, veins and capillaries, without coming in direct contact with body cells. Closed circulatory system is found in Annelids, cephalopod molluscs, choradates.
Earthworm belongs to phylum annelida.