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(i) Draw a schematic representation of transport and exchange of oxygen and carbon dioxide during transportation of blood in human beings and label following parts on it. Lungs to capillaries, pulmonary artery to lungs, aorta to body, pulmonary veins from lungs.
(ii) What is the advantage of having separate channels of heart for oxygenated and deoxygenated blood in mammals and birds?
Or
What is the advantage of having four- chambered heart?

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