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A Moist layer 3.1.1 Identify the gas which is at high concentration in blood vessel B. (1) 3.1.2 State TWO ways in which this gas in B is transported in the blood. (2) 3.1.3 Which large blood vessel receives blood from A? (1) 3.1.4 Give an observable reason for your answer to QUESTION 3.1.3. (1) 3.1.5 Explain TWO ways in which the blood cell labelled D is structurally suited for its function. (4) 3.1.6 Explain why it is not advisable to sleep in an unventilated room where a heater is switched on. (3)
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