In which group of animals, coelom is filled with blood A. Arthropoda B. Annelida C. Nematoda D. Echinodermata
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Solution
Coelom is filled with blood in case of animal groups having an open circulatory system. The open circulatory system is a type of circulatory system in which blood is pumped by the heart directly into the body cavity. The blood is known as haemolymph and is in direct contact with the tissues.
Animals belonging to Phylum Arthropoda have coelom filled with blood.