The element involved with blood clotting is:

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Q: 251 (SSC/NA)
The element involved with blood clotting is:
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question_subject: 

Science

question_exam: 

SSC

stats: 

0,5,13,6,5,3,4

keywords: 

{'blood clotting': [2, 0, 0, 0], 'calcium': [2, 0, 0, 4], 'phosphorus': [1, 0, 1, 0], 'sodium': [10, 2, 12, 23], 'iron': [0, 0, 1, 1], 'element': [0, 0, 0, 1]}