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The circulatory system of insects is of the open type, in which blood or haemolymph is not confined entirely to vessels but flows freely within the body cavity or haemocoel. Unlike vertebrates, insect haemolymph does not transport oxygen, as respiration is carried _______ _________ ______ __________ __________ ____ __________ _________ _______ ___ _____ ________.
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