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B
Magnese
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C
Phosphorus
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D
Iron
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Solution
The correct option is A Calcium Calcium plays an important role in the coagulation of blood (blood clotting). An increased concentration of calcium in the platelets helps in activating various proteins important for blood clotting and thus, results in the formation of a blood clot. It helps in the binding of clotting enzymes to phospholipids in platelets and tissue and accelerates the reaction.