Which one of the following is the key function of the kidneys______?

A.  Removal of excess carbon dioxide from


B.  Pumping blood to the heart

C.  Removal of urea and other nitrogenous

wastes from blood

D.  Removal of excess water from blood.

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The raw material used for the manufacture of the Glass and is cement is :

A    Clay B    Gypsum C    Washing soda D    Limestone