(B) The haemocoel is a body cavity filled with blood,which is a characteristic feature of the phyla Arthropoda and Mollusca. In these animals,the circ

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(B) The haemocoel is a body cavity filled with blood,which is a characteristic feature of the phyla Arthropoda and Mollusca. In these animals,the circulatory system is open,meaning blood flows through the body cavity (haemocoel) rather than being confined entirely within blood vessels.