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A liquid X circulates in the human body only in one direction : from body tissue to the heart. Among other things, liquid X contains germs from cells and dead cells. The liquids X is cleaned of germs and dead cells by a special type of white blood cells called Z. This cleaned liquid is then put into blood circulatory system in subclavian veins. (a) What is (i) liquid X, and (ii) colour Y ? (b) What are Z ? (c) The liquid X is somewhat similar to a component of blood. Name this component (d) Why is liquid X not red ?