(a) (i) 2. IV: V: I: II: III: The diagram below is an illustration of structures involved in the circulation of blood in mammals. Study it and answer questions 2(a) to 2(f). VII. VI- V- (ii) Identify the parts labelled I to VIII. VIII Pulmonary vein 1 -11 -111 TV. Name two features that show that the structures are possessed by humans. ​