Transportation of materials in humans takes place by two organs. Organ ‘X’ is bean-shaped and dark red in colour lie just above the waist. It helps in removal of ‘Y’, a waste material from blood. Organ ‘A’ lies in the chest cavity slightly tilted towards the left side. It pumps continuously and pours a liquid into arteries and through very fine tube-like structure ‘B’ distributes the liquid to various parts of the body.Identify X, Y, A and B
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x - kidney
y-excretion
a-lungs
b-nephron
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